I read techbuys.us and thought of someone wanting to buy techy stuff, don't take this the wrong way, but I don't see many artisan makes wanting to pair up with a "resller(?)" to distribute their keys as that may just add to the price. Take for example ETF, has had huge sales, some that lasted for weeks, ran successfully, everything shipped quickly, and didn't need a website to do any of it just a google form and paypal, the prices are competitive for what other artisan makes charge, and of course depends on the maker, cap, complexity, etc...but I don't see many lining up to want to sell through your store as I am sure you'd want a piece of the pie.
But I do commend you for trying to be a 1 stop shop, if you could find a way to host tutorials, guides, and wiki stuff in 1 place rather then visiting Reddit, GH, and various other sites and requiring some Google-Fu you might just have something.