I get this question a lot, what's the best thing to sell?
There really is no easy answer!
Bottom line, you can sell just about anything if you have the marketing budget and spend it wisely, a decent supplier, an economy where customers are buying and so on.
You could fill your own website with 10 of the most popular items on ebay, but if you don't generate traffic then you won't sell!
You need to do far more than just consider what the best thing to sell is, that should be easy to work out after you have all the other bits of the puzzle put together.