In the advice category, besides hosting files and handling the transations, were you planning to any advertising, submitting your web site to various search engines, joining game dev web rings, posting on newsgroups and the other usual tactics for increasing exposure and traffic to your web store?
Anyone can set up a PayPal button, what do you bring to the table besides that? Are you also interested in running shops for people on such sites as Nuclear Glory, Turbo Squid, EBay, or Amazon?
If you're going to be a salesman, how much work are you going to do to sell products. If you can double someone's volume or free them from the tedium of setting all that stuff up, your service might be worth investing in.
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TAZ
"Do you think it is wise to provoke him?" "It's what I do." -- Stargate SG-1