Forum Moderators: buckworks
Historically, the lack of a true shopping cart has hurt eBay. Sellers typically dealt with multi-item shipping offline, i.e., "contact us for multiple item shipping discounts".
Now with eBay Express, they can advertise shopping cart functionality. The jury is out on how well it actually works. My initial impression is that their shipping costs are quite high.
As for individual product costs, eBay sellers must play the discount card. Customer loyalty is virtually non-existent on eBay, so "how low can you go" is the game plan.
The difficulty that eBay sellers face are the high listings fees charged by eBay; a problem not faced by eCommerce sites.
If you find you are unable to compete with them on any front then perhaps you should investigate quite how they manage to undercut you for the same products and emulate it yourself.
Perhaps they are importing directly, in bulk? Selling OEM versions? Stacking high and selling cheap?
There may be other ways in which you can compete - your pre-sale and after-sale service, extended warranties and guarantees, ability to process a wider range of payments, more information about the product - more alternative products. Product advice 'wizards' to select the most appropriate product may help?
The lowest price does come with pitfalls though. If there is a 1% defect rate first 30 days, but 10% defect rate in the first 90 days, offering a 30 day warranty is going to save the seller a lot of money. They in turn, can offer you better pricing with the possibility of your product going bad after 30 days. You'll likely pay a high restocking fee to return a product. And, oh yeah, you are responsible for return shipping. If you're shopping for lowest price, the seller has to skim somewhere.
The stores which come out at the top of the price comparison results and still make a profit on each sale are eventually the big winners. Stack them high and sell them cheap. Because if you're not the cheapest then you won't shift many items any more.