We have a ebay store at
http://stores.ebay.com/valxart and fees can add up quickly even if there are no sales as it often is when your starting up a store.
Its cheaper to list items in a ebay store than on auction, but it still cost a insertion fee of .05 for a single title listing per month. We don't mind commissions on sales, but fixed monthly cost add up quickly. We also list items with ebay givingworks which donates 20 to 40% of sales to non-profit orgs but the same listing fees apply even if no one buys. We have done this only a short while and its far to early to say it works well.
Listing fees for 80 items currently in our store and store monthly fees amounts to $25 a month. If we added the best 1000 card designs our cost would rise to $75 even if there are no sales. This encourages you to list fewer items.
Ebay fees are more acceptable on high ticket items.
All this shows why i love GCU
At GCU We are free to list lots of designs and let buyers decide for themselves .
We find it hard to predict what people like. We have images we were not wild about and are delighted to discover people connect with them and buy them.
If I had to pay monthly for each listed item I would only list the items i liked and would miss out on discovering what customers like.