Unless you're playing NL400+ or limit 10/20+ (in which case you should be getting rakeback instead of whoring bonuses) then you should almost always, always, always, always, always, always, always, always be chasing a bonus of some sort or other. It's free money. It takes so little effort and you only have to go out of your way a little to adjust to a new site but the rewards are so big. It's like you're walking down the street and see $500 stuck in a tree, are you going to take the time and effort to get it? Of course, even if it means getting a ladder or spending half an hour trying to climb the tree, it's free money for very little effort.

Eh, if you're playing limit 5/10 even then a bonus is overrated, its more about finding a site where you can find a good game at all times (Party and Stars pretty much). There's little point to playing a bonus at pokerfantasy for example if you cannot find a game bigger than 1 2/4 table during the day.