I will stop mining with my mac book pro instantly and rather save the environment electricity. 

...  for your clear, fast and precise answers. 

Rightyright, I am a total newby,
so I post 3 minor questions which are alone not worthy of an entire threat here.
Together they should be worthy of one 

1. Let's assume that many people will over time loose their Bitcoin Wallets, because computers crash, people forget the few coins they had, or don't bother, or other disasters happen. Does that not mean that in the end we have less and less Bitcoins ? Ok, some of you will answer that the 8 digits after the comma will provide the flexibility to turn even a million into a multiplesomethingquatrillion, which brings me to the next question:

2. I tried to transfer today 0,00000001 Bitcoin from my Bitcoin Client on the Mac to MyBitcoin.com but it only takes minimum 0.01 BC, reverse the same when trying to transfer from MyBitcoin.com account to my BC Client > "Payment amount is too small for a Bitcoin P2P payment! Try a BC0.01 or higher!"  So where are actually the promised 6 more digits after the comma ?

3. I got this generus 0,05 BC from this starterpage, and I still can see the transfer in my BC-Program. What only puzzles me is that that deal which was 2 weeks ago is already aproved over 3000 times and continues to be approved more. Aren't so many approvals a waste of computer calculations ? I mean there could be a lid on the ammount of any deal to be approved.

That's all for now and I hope not to have created confusion by throwing all my eggs into this basket.
Thanks for your inputs.