Well there is definitely a caveat here... If we were to charge $15... there is no guarantee that there will ever be 100k more accounts. I agree with your logic and the math makes sense but I know people love free things, that is why fb, twitter, and snapchat all work. If any of them were to charge their business would crater. I realize Steemit is different because you can earn money from it, so what is the right price point? I am not sure... my personal opinion would be to stay free though. We desperately need more people...