The first time I started a bounty I was able to choose 50, but every bounty since then the minimum is 100. I still see other bounties of only 50. Any idea of why I don't have the 50 option any more? (This is across Stack Overflow and Programmers, at least.)
This is the latest answer I considered placing a bounty on How to populate a private container for unit test?
That particular question does have an answer from me.