After doing the ebay thing i've realized a few things:
Set your auctions to end on a weekend if at all possible. This will ensure that people are watching the count down and my snipe it.
If you're doing collectible items, take the pictures yourself WITH the items in protective cases (card sleeves, etc). This shows that you really do have them and they are in good shape.
Single items don't sell well. You'll actually get more for putting things together in groups of the same thing or things that go together.
hope this helps whoever reads it!