When the bounty system was created it seemed reasonable to set the minimum bounty at 50 reputation. However there are now hundreds of questions under the featured tab. It seems the featured tab has become less useful due to the large number of questions it contains.
We should consider removing 50 rep bounties from the featured tab. While we would still allow 50 rep bounties, they would largely be considered tips for existing answers, since they would no longer bring the question onto the featured tab.
They would still act like bounties in every other way, such as bumping the question, but merely wouldn't show up on the featured tab.