I would take it for 4 BTC if it is ok for you to let me try out if the code works beforehand.

A bit more than the current hashrate of Bitcoin combined (~48 Petaflops according to http://bitcoinwatch.com/)

Uhm, that's even more expensive than in Euros, no thanks. (if "TBC" = "BTC")

I think I stated my price quite clearly, I might go up a bit if really needed, however for sure I'm not selling BTC at 4 EUR/BTC.

As difficulty increases, you're not very likely (if it continues like this) to mine even 10 BTC within the next 5 years with this card!

Think of a hash as a much more complicated sum of digits:

1337 --> 14

I now can easily verify that 1+3+3+7 = 14

However, I can NOT say if this 14 is derived from 95, 1733, 842, 7700000 or any other number that happens to have a sum of digits equaling 14.

See page 2 in the very thread you quoted?!

 

1: As long as you're mining, you can't sell the hardware. In the end you'll have to mine (converted to EUR/USD/whatever) about as much as the "costs after x days" column says minus what you could sell your hardware for (as there is no predefined value, I didn't include that). I also didn't include difficulty increases + projected income, as this is far too speculative.
It would be up to you to guess how much a used card might be worth after x days.

2: Just add it yourself?! It's not rocket science and I did this sheet in ~15 minutes.
If you want to have it from me, I could also sell it - 1 work hour @ 20EUR means this sheet is worth 1 BTC. PM me for an address.

Yes.

Example:
http://www.amfeltec.com/products/x1pcie-splitter3.php

Google spits out ~1 550 000 results for "PCIe splitter" btw 

This "amazon.de 5 EUR gift code for videogames" is limited to only buying video games I guess... - but can you use more than one (for example buy a 50€ game with 10 of these)?

Also it would be great to buy gift codes on Amazon.de in general.
Another thing that might be in higher demand would be Rapidshare - maybe you can try to be one of their resellers?

http://store.steampowered.com/app/901436/

As today this game is half price, I'd love to buy it and would give out 2 BTC for that.
Only prerequisite is that it works on Steam in Europe (I have no idea of there are differences between areas).

Just contact me here or via PM, you'll get my mail adress and can send me a "gift" - I'll pay you as soon as it could be verifiably added to Steam.
Should you have a key code for this exact version (Deluxe Gold Edition) floating around, I'd be happy to buy this too instead.

Deal?

I'd rather get a PCIe splitter...

Here's a (imho) more useful representation (click on picture to see bigger version):



Y axis:
Total Megahashes (MH/s*60*60*24*[#ofdays]) until that day divided by EUR spent until that day (calculated from Wattage + costs per kWh)
X axis:
days

Here you can see that if you just plan to mine short term, a 5830 can be a VERY useful investment --> in the longer run however a 5970 might be hard to beat.

It's also quite fun to play around with electricity costs or MH/s for example and see the lines jump + rearrange!

It might also be useful to determine if you want to spend for example 500€ in the next 90 days to determine which card would bring the most performance until then.
(Multiple cards btw. have exactly the same ratios - 2 cards cost twice as much, use twice as much electricity and also calculate twice as many hashes)

300 MH/s on a 6870 is only possible with heavy overclocking imho, I run at ~990 MHz (already overclocked!) and have ~280 MH/s!
Another ~10% more as in this Excel sheet is quite hard to manage...

And urinated too! 

You just don't want to have pool water in your computer, heat exchangers are no rocket science!

We need data for 6xxx budget series... (6670 etc)!

Also it would be cool to have this on Google docs, might even be possible to embed it in the Wiki like this then.

Another 2 columns that would be interesting: "cost after x days with y Cents/kWh running 24/7"(buying + electricity derived from Watts), "billions/trillions/quadrillions(?) of hashes checked in these x days"

I guess I could hack together something like that quickly...

Happy 100 btw.!

Hm, I wrote "50 bitcents each"... 

Anyways:
In total this offer would be for buying up to 6 shares. Each of these shares needs to be sold at max. 50 bitcents, so it would cost the one offering this max. 3 BTC.

Well, at a difficulty of 400000, 100MH/s give you ~25 bitcents per day.
Times 6 to 8 = 1.5 to 2 USD/day
You need to know your Watt per MH/s ratio yourself, but a ratio of 1 (including other peripherals/CPU/RAM...) is already quite ok.

This would mean that you use up 4*2.4 kWh to mine 1 BTC --> 9.6 kWh need to be worth less than 6-8 USD.

You can also do these calculations backwards to see at which difficulty you pay more just for electricity than what you get in BTC.

It displays in Satoshis and could probably be rewritten locally quickly to display the numbers in a more human-readable way... as this is planned for the next version of the client anyways afaik, that's not too much of an issue imho.

Also as a side note:
in some countries you have a decimal seperator that looks like this "," and in other countries you would use this "." - could easily lead to input errors or confusion (1.000 would mean one thousand for me and be equivalent to "1.000,00", but someone else might just say it's a one with 3 zeroes after the decimal point).

Market depth SIN:
bids --:-- [[6, 50000000], [10, 1]]
asks --:-- [[12, 84500000], [144, 84500000], [5, 99999998], [1, 99999999], [6, 99999999], [3533, 100000000], [2, 100000000], [1, 490000000], [3, 2000000000]]

^^^^
And should you want to buy, there are quite a lot of shares for less than 1 BTC available too!
Bids is what people wanting to buy shares are offering to pay for 1 share (in Satoshis, so 100000000 = 1 BTC), asks is what shareholders want to have for their shares.

The bid [6, 50000000] would mean for example that someone would pay 50 bitcents each for up to 6 shares.