I'd certainly be interested in a new platform. I've always hesitated to "publish" my work through drivethru due to their ties to rpg.net and kickstarter just always feels like a bad way to get in over your head.
I want to create something developer/Publisher friendly so they can post their items and not feel like they are walking on egg shells. That is no fun. Kind of how it feels posting on the big purple.
My advice would be to do this project in equal partnership with an established RPG designer (Pundit would be my first choice, but Grim, Venger, Raggi, or TheEvilDM would also be a decent choice, or maybe someone else who shares our views). No offense, but you are not exactly someone that people would eagerly put their trust in to sell their products since you're not an established name in the industry. I think that you will need the credibility of someone who's, at least somewhat, a known name in the TTRPG medium.