Does this always happen? I haven't even sold anything!

How do I stop it (If it's meant to be stopped)?

I get that eBay takes a percentage of the final value and the cost of advertising it on the site, but why do they continue charging me every month, when I haven't sold anything since?!

No idea, maybe you'll find your answer here? : http://pages.ebay.com/help/sell/fees.html

I couldn't seem to find anything. :/

I'll try to contact them I think.