I'm confused about blackjack bonuses

[DavidC]

A few days ago a guy posted, saying that he was up a bit of cash in BJ, and would like to know if he should reduce bet size in order to cash out a win (he was close to clearing a bonus)...

Now, if a guy asked this in the poker forums, he'd be lauged all the way home. They'd tell him that it's all just one big game.

So... is there any real reason that one would adjust their play in blackjack while clearing a bonus? Is there something that I'm not understanding here?

--Dave.