http://cur.lv/4tw4t

Flexible membership fee (you can start with 0 btc!)
Passwordless registration
Unlimited hierarchy
About half of deposited money goes to random members
New members that do not follow referral links become referrals of random members
Automatic payouts when member's income hits the threshold (0.021 btc)
All the pyramid info (payments, withdrawals, database backups) is published on the site
Due to previous 2 features, there is almost nothing to hack!
2 ways to earn money
Attract referrals and build unlimited hierarchy
Deposit more to increase your income and win random payments and referrals