to say the truth the old set's are the ones that make money if you win a rare wanted item you can sell it for much more.
Really? Then why aren't you doing it?
I think your buy-on-eBay-to-resell-on-eBay theory is fundamentally flawed.
when you sell on ebay all you win it's your's or they keep from you some amound??
eBay keep back a portion of the sale profit, and of course there's a fee for listing in the first place, so if you list a lot of stuff that doesn't sell you will be out of pocket. You can look these fees up on eBay.
Don't forget there's also the cost of postage. I've won several auctions recently where the postage cost was 50-100% of the actual item cost.