Other than catering to smaller vendors, how is your idea any different from a mall? But even malls have smaller vendors in the middle booth spaces.

You say that there will be no overhead and no payroll. But, you also say that you are charging rent. That is overhead. Regarding the payroll...are you saying you're going to watch their location for them? Who will be manning the store? I'm assuming your answer is them - right? Well, they may need to pay themselves something. So, that's payroll.

I'm sorry, but I don't understand the difference between what you're offering and what any other resale shops offer (other than the new products I suppose).

If the only difference is the type of products sold, then I agree with BizResearcher, your idea has been done before and thus you have plenty of resources.