Hi @knircky, Just learnt about Steem Bounty a week ago. I think:

Most of the Steemians are Minnows and they care about getting upvotes more than anything else. There are several ways to earn free upvotes and grow fast at Steemit. The next promo could be about listing all those ways and who does it better than others, wins.

Also, less people know about Steem Bounty so there should be aggressive social media promotion to get the word out. Weekly contests is the best way to get huge attention of the audience. Just my 2 cents!

Steem On!