I use @steem-bounty quite regularly, actually. It's a good way to attract some more readers - last time I checked, there were still quite some bounty hunters ;0).
I use it mainly when I have a question, or I want to know what people think. It's also a great way to reward participants in a contest without having to spend all your voting power: you give them a small upvote, and they will receive a part of the @steem-bounty as a reward when the post reaches payout. When hosting a contest, it happens that I forget to write a winners' announcement 7 days later. Fortunately, the @steem-bounty system doesn't forget, so participants will receive their share.

However, it is important to strictly follow up on your comments, because sometimes, a valuable comment comes in only a day before the post reaches payout. So you need to stay alert and make sure you stay on top of the comments and upvote the ones of which you think they deserve part of the bounty.