Bingo.
Worst bit is, and in my experience this does happen, regular Ebayers coming in and bragging how much cheaper they got their stuff second hand, and trying to actively dissuade people from buying whilst in your store. They then get the right arse when you have a quiet word, explain the purpose of the shop, and request that they either keep their purchasing habits to themselves, or be banned.
After all, you wouldn't waltz into a nice restaurant and sit down with sombody else's leftovers, nor would you buy some cans of beer from the supermarket and drink them in a pub in full view of the landlord.
Same thing here.