farmboy - 3:29 pm on Jun 18, 2007 (gmt 0)

1. Increased fees
2. Buyers/sellers who seem to be irrational
3. Inefficient feedback system
4. Fraud

All of the above are obstacles for eBay.

But I think the third-party automated bid sniping services don't get nearly the credit (blame) they deserve for dampening the user experience.