Absolutely NOT! When you bid and buy on ebay it is a contract. There is no difference if someone hires a person to install a fence with specifications, ie. So let's say the contractor installs the fence to the buyer's specs. And then the buyer decides they don't want a fence after all. Should the contractor refund the money to the buyer? No. It's a contract. The contractor installed the fence according to the contract and that's that.
And if people who can't read, or abide by ebay's rules, and the seller's requirements, then they need to get off ebay, and buy somewhere else.
As a seller, this stuff drives me crazy. I don't have "layaway" and I don't sell "on approval". You bid, you buy, and you pay. End of story.