I think this is not a great business model. You are planning to take the distributor portion of revenue but also take the additional risk of making the art. This could maybe be okay by itself but probably not. However, additionally it sounds like you want to bring xblig quality games made by young people to ios. Something like 90% of xblig games make less than $200, on the more competitive ios app store they will probably make less.

You need to change your business model drastically for this to succeed. I don't think you will break even with the current business model, much less make a profit.

Most people's first 4 video games fail spectacularly, the younger they are the more likely this is.

There are some exceptions but I doubt they will cover your mounting losses. I am the only person I have ever heard of whose first video game made it on to Steam, but while my game made it on I think many many games did not. Also I was a grad student in engineering at the time, not a high school student. You are essentially trying to VC video game development but only take 30%. This will not work with a 30% cut, and it won't work anyway unless you become a lot more selective on which games you choose to invest in.