Scroll past the self-promotion stuff at the top of the page for an informative article on how Yahoo's new PPC program is impacting the effectiveness of Yahoo Stores. Yahoo's new business model is an extreme change for Store owners.
For existing Yahoo! Store merchants, there are no guarantees that you will not lose your shirt.
A few of the key complaints with Yahoo!'s new set-up include:
Rather than open up the Yahoo! Shopping directory to other merchants while allowing Yahoo! Store merchants to continue to be listed on a revenue-sharing basis, Yahoo! opted to REMOVE this benefit from its existing store owners. They too are required to pay CPC fees to be listed in Yahoo! Shopping (although they do receive a 20% discount).
You have very little control over your CPC fees. While you can select the categories in which your store is listed, each category has a flat-rate CPC fee rather than a bidding system (which would allow "wiggle room" to balance profitability against cost). Many categories are prohibitively expensive.
In any other CPC campaign, an individual would not pay 19 cents when it was most profitable to pay 12 or even 24 cents. Yahoo! has made it very difficult to achieve maximum profitability. Typical category prices range from $0.19 to $1.25 per click.