It's called proxy bidding. I think the real problem is a lack of understanding of how the system works. It's all explained on the site.

Proxy Bidding
The feature of an auction-style listing in which eBay automatically bids on the buyer's behalf, up to the maximum amount they set. Enter the maximum amount you're willing to spend on an item, and eBay will continue to bid incrementally for you until either you're the high bidder or your maximum is reached. This means you don't have to keep coming back to bid every time someone else places a bid.