That is pretty horrible. You encourage people to delay their payments and then just up and delete those stats, so you don't have to payout, after only 30 days.
Sorry, but Daily Bitcoins is a business entity, not a charitable organization. We make payouts from advertising income which can significantly fall during these 30 days and we cannot afford to pay in own loss.
These conditions are clearly stated, so you must not have any reason to complain.
With such tiny payouts it is hard to build up much in just 1 month.
Minimum payout is just 10 booby prizes (or 1-2 custom prizes). I don't think it is so much!