PokerStars Bonus - how does it figure?

I bought in for the max 600 to enjoy the 25% bonus at Pstars. Needless to say, it is taking a very long time to accumulate the points at 1/2 and 2/4 (I will enjoy my tshirt though...). I am having trouble figuring the true impact. It seems to me that since you get the money $.25 at a time that it is simply a rake reduction (not to overstate the obvious).


Assuming that one plays a normal tight aggressive game, sees about 20-25% of the flops and wins about 60% of all showdowns, are we playing with no rake? Just curious. I am not cashing it over to my account until I get it all and I am about $25 dollars up through 1/2 300 fpp's (half of the bonus - but my QQ lost to AA with AQ on flop two hands ago and it cost me a bundle...)


Thanks,

kevin