This information is needed for people to make an informed decision about buying mining contracts. I have no experience mining but am interested in getting started. Here is some current information for 50GH/s 1 year contracts:
Cloudhashing Platinum- 10% management, 30% reinvestment
$3,999
Bitcoin Frenzy - 7.5% management, 25% reinvestment - Located in London
$1,999
E-pickaxe - no overhead fee, no reinvestment - located in Argentina
$1,500
When researching this i noticed many differences between contracts. First, not all companies have contracts for sale immediately, they are often future contracts to start production in next 1-4 months. Second, the fee structure is variable. Many companies charge a 10% administrative fee so that you do not get all of the bitcoins that are mined by your contract. Additionally, some contracts divert a percentage of Bitcoin revenue to reinvestment in new hardware. This allows the hashrate to increase over the term of the contract. Since the difficulty constantly increases this could provide more return.
This site
http://bitcoindifficulty.com/ shows the increasing difficulty of mining Bitcoins over time.
![](https://ip.bitcointalk.org/?u=http%3A%2F%2Fbitcoin.sipa.be%2Fspeed-small-lin.png&t=663&c=Z17L4-hXiw8VOg)
This calculator (
http://dustcoin.com/mining) gives immediate return as far as how many Bitcoins or other coins per day you can expect to mine with a given hashrate. So for 50Gh/s you can expect to mine 0.0213 Bitcoins per day. At $800 per Bitcoin, that works out to about $120 per week. For a $1500, 50Gh/s contract, the break even point is 83 days.
This calculator
http://www.bitcoinx.com/profit/takes into account the increasing difficulty when calculating a return on investment. Plug in 0 for the power cost since you don't pay that for a mining contract. You have to deduct the overhead (usually 10%).
If the difficulty does not change, you would make back the contract price in under 15 weeks and the remainder of the year would be profit. The difficulty WILL increase and therefore the contract will be less profitable. According to their projections, the break even point given the same assumptions (50Gh/s for $1,500) is 94 days. So that is an additional 11 days of work to account for the increasing difficulty over that timeframe.
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