I have zero issues with buying "like new" clubs FROM REPUTABLE SELLERS. I have been a big fan of www.callawaygolfpreowned.com and have bought "like new" wedges, putter, and multiple fairway woods from them. They also list their clubs on eBay. I just have never bought irons from them...yet. Their "like new" has always been pristine.
I would recommend staying away from some stuff on eBay as there is A TON of counterfeiters out there. I do not trust anyone on eBay selling driver shafts as it is super easy to buy a premium shaft only to find out later (when you replace the grip and see what was underneath the grip tape) that it was a repainted $10 shaft made in China. Sure enough, I found a manufacturerer in China that counterfeitted shafts and they would have sold the counterfeits to me in bulk.
I bought GolfPride iron grips once only to find that they were fake. As soon a a drop of solvent touched the Golf Pride logo, it ran.
There are several YouTube videos showing how good counterfitters are making things look. I am not saying everything is counterfeit, but, buyer beware.