I don't want to, like...immediately discourage you from this, or anything, but I think creating a functioning, profitable, and successful competitor for a market that's honesty fairly niche as it is, sounds like a pretty far reach, especially when, from as far as I can see, the sole business plan is just to make something better than Patreon.

If you're serious about going through with this, you're going to need something much more substantial than this to pique interest from both clients and investors/sponsors (because if you really want to make this work, you're going to need some funds to start the site with that ISNT a flat rate from clients who have no idea if their work is even going to be profitable or not).

Do you have any sort of business training? Handling finances? Have you looked into state and federal laws and regulations and licenses?

Like...again, I REALLY don't want to be that guy, but I think it's much, much too early to be trying to gauge interest when you don't even have a mock up or a business model or really much of anything for people to look at yet! :0

edit: I also disagree with the monthly rate, especially when patreon offers free and (I believe) unlimited space? I'd much rather pay a profit margin than pay more than what most patreon creators end up making per month or per work, in reality :/