Thanks dude!

I basically want to get a basic front end up and running... then open source it for Utopian fun, and then offer Fiat to devs to help out. I really want to be able to understand all the code in the system so I'm not reliant on anyone else for time-critical support.

I completely agree with everything you've said... and want to confirm that while Steemhunt, Dtube, etc all entice existing Steemians to use their Dapp, I'd be going the exact opposite way by bringing a lot of new content creators to the blockchain... and I'd expect their rewards to be absolutely dismally minimal... so yes to your calculations, and almost none of the 8M would find it's way to my users... except for the occasional curie or welcoming vote.

On that note, I'm also not sure I could offer anything to delegators... and so wouldn't expect anything from the blockchain in that regard. Alternatively though, I do feel confident I could muster up some external sponsorship - it's a huge industry and there are lots of people making money from their gyms, competitions, etc. The space has yet to become too crowded with options. Exclusive content should be really easy to sell... and I really do believe that becoming THE place for Ninja Training won't be too hard at all. I've already got a fair network and personal contacts.. and as I mentioned, I don't believe I'd have any competition in this space.... yet.

I actually really like your idea of just thinking about the rewards later. I didn't want to design anything that might handicap me later, and maybe I can just build it, bring them across from Instagram, delight them with the content and community and then try and transition them to the blockchain... by which point I might have some stake myself or have found some investors/sponsors that like what I'm doing.

Thanks again mate!