Dan's right in that if you're listing top-notch items, they will do well regardless. My caveat about the lower prices for eBay auctions (as opposed to fixed price) was with the understanding that the top-notch stuff was going to the auction house(s) and you were selling the leftovers on eBay.
As for the listing fees, depending on what kind of store "subscription" you have, the listing fee is a flat fee of a few cents, regardless of the asking price of the item. If you don't want to fool with a store subscription, you can always get up to 50 free auction listings per month (again, regardless of the starting price) and if you watch the announcements page (
http://announcements.ebay.com/) they have a "free listing" day usually every week or two, though you'll have to be sure you follow whatever guidelines they have that week to qualify for the free listings.