Are you kidding? When people buy an item these days, especially from a USA seller, they expect to have it in a few days. Not in the time it takes to have an overseas seller ship the item to you and then you forwarding it on to the buyer.
I see tons of negative feedbacks for slow shipping times at a minimum.
Also, you are listing someone else's item. What if you sell the item, only to find out the other seller has already sold it? eBay does not really like cancelled transactions, so in volume it would hurt you.
If an item is used, it is especially dangerous as people tend to overstate the condition of their items. I've purchased DVD's as "like new" that had scratches the size of ditches in them and cracked cases to boot. Sometimes, even a "new" book has creases in the cover or someone wrote their name on the inside flap.
Your plan has the advantge of not having to have any money invested in inventory, but you will have to spend a lot of time dealing with angry customers wondering where their items are, or why that supposedly "new" item you sent to them is obviously used.
There really is no free lunch.
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