Last call before the fall, fail, back to school.
Thanks for crunching the numbers in the thread.... Economics at best make this break even--- and that's with free labor / volunteers doing all the human work.
The price is literally too low. Abuse will flow from this like a 4th of July picnic in a trailer park. DMCAs, legal take downs, government nastygrams for info... they all take time to deal with. That's not stuff you can delegate to volunteers, nor can you for long just ignore such. So I'd say OP has at least 10 hours a week - 500+ hours a year to self-volunteer. Talking about 2 hours a day Monday-Friday, after school, after any real job...
One payment issue with funds not accessible and you are done.
Other problem I see, in making the numbers work, server being used is likely lowly supported and not intended for such use/business. So your upstream is bound to become mighty pissy about issues and your customers.
But, by all means have at it... Having the gumption to try is worth something and you will learn.