A perpetual lottery would be a hook that many people can't get away from. Imagine:
You can win whale votes as long as you are active on the Steem. Some posts (approx. 12 times/year), replies and a growing steempower shows you are active. Now you are eligible to win.
You may ask @moecki. His finanzbot named Dubby just needs an analyzing tool and a random generator. Dubby is near to be a perfect tool for lotteries.
It's not a hook. It will work like glue for flies.