[playersare]

$1/2 LHE average pot size will be $10-12 which will rake 50c. so split that amount by the number of players dealt into the hand, and the attributed revenue per player will be 5 cents (10-max) to 8.3 cents (6-max).

USA Poker is therefore offering you 50% of that revenue back as bonus, so accounting for hands which are raked slightly more or less than the average, you'll expect to earn between 2-5c per raked hand for those first 21 days of play.

generally speaking, you should not deal with any low limit bonuses which pay less than 100% rakeback equivalent. many sites have 200-400% and even higher available. if a site is going to offer a 50% rakeback deal, at least make it longer than just 21 days so high volume players will stick around. very unappetizing marketing by USA Poker.