It's all about the Iron, baby...

[Talking Poker]

This is correct... but remember that you are getting $100 in rakeback PLUS the $100 bonus, so for this time period, you actually grossed $200 in total free money. That's how I look at it.

Fancy Schmancy TP Forumla:
Free Money (FM) = Bonus Money (BM) + Rakeback (RB)

When BM = 0, RB will be at its max.
When BM > 0, RB will dip, but who cares? FM is the number we care about, and that will be at it's highest when BM > 0.

When you crunch all the numbers, it works out to a 40something% of your rake that you are getting back when you have a bonus to clear as well, instead of just 27%. In other words, bonuses are a good thing.