Just throwing this out there. If I missed anything, please point it out instead of flaming. I was a bit confused by the FAQ, so there's quite a possibility I overlooked something.
Assuming one maximizes his or her rewards by signing up with a referral, depositing a minimal balance, signing up for another account via referral to the user's first one and depositing another minimal amount, doing this again for a third account, and finally signing up for a primary account with the referral from the second and depositing the funds to invest, he or she will end with roughly a 40% bonus (if one bitcent is in each of the first two accounts, the total bonus is 40% minus 0.003 from the first account and 0.0015 each from the second and third; so, only 0.006 BTC are "lost" in this case.) No two deposit addresses for these accounts are the same; in fact, this would give a net loss compared to waiting for the complete reward on all three, as more would be sent up to accounts that are not property of the user.
The 40% bonus is calculated as follows:
1. 10% comes from signing up with a referral (to the third account.)
2. 30% of the total income (without the 10% bonus, so as to keep it at 10%) is sent upwards to the first two accounts and the mostly irrelevant referral account.
3. If that 30% is "lost" (sent to other users,) only the 10% bonus is gained.
4. Account 3 gets 15% of the deposited BTC. Accounts 2 and 1 get the other 15%.
5. The first three accounts gain small amounts which give minimal BTC to the original referral. This negligibly decreases the 30% bonus assuming a reasonable amount is deposited to the main account.
Let's assume one deposits 10 BTC to the main account. A total of 1 BTC is gained on that alone. On the remaining three, one will gain 1.5 BTC, and the other two will gain 0.75 BTC. 4 BTC is netted.
The reward time is now roughly 1 year. This means 40% is gained per year, based on my calculations. This equates to about 0.649% per week, compounded. Compared to other investments it doesn't look like much. The main reason for using PyraMining would be for the reliability of the use of mining.