Store Owner is not "Powerless". Lets take Swee Lee for example.
1. They let customers leave bag near the door, can customer do anything about it? no.
2. Customer walks in and gets filmed by dozens of CCTV camera, can custom do anything about it? no.
3. Customer walks into the more expense showcase but is blocked by railings, can customer do anything about it? I think you get my drift.
Another case (Hypothetical):
1. Customer walks in and gotten sales talked into buying something cheap at a really high price. Can customer do anything? no.
2. Customer walks in and bought a guitar, gets home and its broken, but can't come back until next week because he has to fly for a meeting. gets back return to store to complain, then store owner says they only replace within 7 days. there is nothing a customer can do about it.
if you can see, it is really the customer that has no power. All a customer can do is to be very meticulous when buying something. Thats why a customer has all the right to test a guitar and not buy it. that is his only weapon from being conned.
Another thing, if you go and buy a furniture or electronic, they usually dont give you the one being displayed right? its because display items are usually gets scratched, slight damaged for being displayed in the first place.
display items are usually sold at half the price.