Need some advice

Hi Guys. I am a graphic designer and I have more than 12.500 graphics that can be used as logos in some conditions. Most of the graphics are made by me in the past 3 years but I also have stuff modified from free logos that you can find online. I also have a nice collection of unused designs ripped from 99designs ( it's a blackhat forum right ) ? The thing is that 90% of the graphics are modified in order to avoid any copyright issues and I also have the eps files for the designs .

I am wondering if it's worth to start a service in order to sell the graphics ( png,transparent and eps ). All the files have more than 7GB and most of them are at more than 300dpi and they are sorted by categories .. ex : ( real estate , seo , abstract,corporate,people etc ) . My guess is that they would be great for someone who is trying to sell on fiverr on similar sites..

I'd really appreciate some advice from someone Thank you in advance ( I hope I posted this in the right place )

Well the 99designs thing, is copyright infringement..to be honest. This is a blackhat forum but for SEO, anything illegal(stolen or copied without permission) is against the rules.

But for everything else, if it's yours and you own the rights, I don't see any reason to not sell them.

Thank you for the first advice I received so far