I've just found myself in the following situation:
I had a little over 100 reputation on CrossValidated and found a question that I wanted to award a bounty to. And so I did, however, this brought me below 50 reputation which left me unable to leave a comment on said question clarifying some points.
Arguably I should have:
- left a comment with the bounty itself
- not offered up this much reputation in the first place
However, prior to offering the bounty I did not even know that a reputation limit for comments existed at all, mainly because after accumulating enough reputation on one site, you're automatically awarded 100 on signing up to any other which makes it very easy to forget about the reputation limit because you never encounter it again.
So, I think it would be sensible to either:
- outright forbid users from offering a bounty higher than their reputation - 50
- warn them about it if they try