An interesting thing I noticed the other day was that when someone was rattling off all the requirements to post a bounty, one of them was "Not on a Stack Exchange 2.0 Meta". Which, in glancing, is true - you cannot post a bounty no matter how high your invisible reputation is, nor is your reputation on the parent site useful for it. I don't really mind this as it really makes sense.
But I've got a little nag on my profile telling me to consider posting a bounty on an open question of mine. Which I can't do. And likewise, we have Altruist, Benefactor, Investor, and Promoter on the Meta when it's impossible to attain them.
I realize that actually changing the profile thingadongdong and changing the actual badge listing on the Meta sites is a lot more complicated than just adding a conditional to when you can start a bounty. So this is a low-priority feature-request. But, if it isn't too much trouble to implement at some point in the future, it would certainly help stave off the occasional confusion.