I have come up with some rules for eBay.

1. Do not bid on any items until the end. The exception here is when you want the item to appear on the list of bids rather than the watch list.
2. Do not sell more than one item at once unless you want the price to drop. If you run it as a dutch auction you are less likely to have people bid against each other. Sometimes even delay between items so people think you do not have any more left.
3. Use the 10 day option if you have something that you think might not sell well. You want to maximise exposure.
4. Just because a seach for something does not bring up any results does not mean that it will not sell on eBay. And if it does not sell this week it does not mean that it will not sell next week.
5. Having said that, there are some items that will not sell on eBay.