Sure, @tipu nominate hide :)

1. Yes!
   .
2. Check out https://www.steemprofit.info (keep in mind that the #2 is falling hard and #1 - the owner pays for all the votes as far as I can tell).
   Basically if the curation reward would reach average lvl of 50%, @tipU should be able to power down around 1k STEEM daily which should translate to around 13.5% ROI for delegators.
   But we want to reach higher than 50% average + there could still be income from vote selling - but it would be treated purely as promotion so no more positive ROI for vote buyers (when you advertise in TV, the TV doesn't pay you :)