I'm a bit rusty on the design side I'll be honest but I'll give it a go.
I've seen a few competitions where you set the post to 50/50 and dish out the liquid steem as you see fit, but keep the steem power for yourself as a commission for running it. It may be that you want to cash 'some' of that in as maybe a monthly prize or longer term but I don't think it's needed.