What type of bounties do you want to see more?

What are your favorite type of bounties on Hive account@steem-bounty? Let me know your opinion in the comments.

I'm thinking of using this (d)app more since it's pretty effective, most posts get a lot of comments when you put a steem-bounty on it. 

Imo steem based projects could use this to get more interaction on their posts and reward their user base. I don't get how it's not more popular.