I don't mind sharing stories but I'm not going to show and tell. Here where I live the thrift stores use search engines to price items. I don't want to post a picture and selling price so that store can see it came from a block up the road lol. Or I bought it at their store 3 days earlier. As for competition here everyone is a "American picker" or Rick anymore. I see people buying stuff that's .50 for 10 bucks and thinking they have a great deal. Then it gets slapped on ebay and a thrift store sees it or another seller sees it priced at that and guess what. Now that item will become a $10 item all over the place.
Don't believe it, watch one episode of the picking tv shows. Then google it and see how the prices are. They'll be pretty close. Same principal applies here.