Hey, thanks :D
> Pricing: you could tie pricing with the performance (pay $1 per extra followers that your best version is getting - cap at $X0).
That's interesting, I never thought about this pricing model haha. I'll see if this makes sense. For example, you might get some followers from people that have not clicked on your profile (name hover or suggestions) (and there is no way of detecting this).
> Marketing: use the twitter api to find accounts that need you the most. Probably businesses who tweet a lot with little engagement. You could target newly funded startups, maybe look at who's posting on product hunt etc.
Good idea. I'm also thinking about reaching out to social media agencies. They might be interesting in a tool that will help their clients grow on Twitter :)