Yeah, I hate that. Lately I've been trying to fight back against these shipping charge scams.
Excessive shipping is actually against Ebay rules, and can be reported. Since Ebay auction fees are based on the selling price of the item, some sellers try to sell an item at a really low price, and then take a huge profit on shipping. Many auctions say "no reserve" but are really hiding a reserve price by charging twenty or thirty dollars for "handling."
The problem is that there's no way to filter out high shipping charges when searching for items. It's a waste of time to have to find and read the whole auction listing before discovering that the shipping and handling charges cost more than the item itself is worth.
So now when I see an auction with "ripoff level" shipping charges, I click the "report this item" link at the bottom of the auction page. There's a specific category for reporting excessive shipping charges.
It's quick, anonymous, and Ebay takes it seriously enough to warn the seller right away. (I reported a guy that was selling 99 cent DVDs with a thirty dollar "handling fee" hidden deep down in the auction text, and his auctions were cancelled the next day.)
Maybe if enough of these sneaky sellers get their auctions cancelled, we'll start to see more honest shipping and handling charges.