There's probably other criteria, such as cost of the item. Returning 10 items that cost 20 dollars is different then returning 4 items that cost 500 dollars.
I think this is it! It's not how many times you return things, but probably that you returned things that are expensive, or are items that have a low return history.
I did know someone who 'played' Circuit City, but buying high priced items (computers, TV's, etc) and return them and then watch for them to pop back in the store as 'Open Box' at a sometimes huge discount. I worked at CC for a stretch, and actually don't doubt that as a possibility for some of their customers. I had heard that some of the more densely populated Best Buy areas were shipping returns to another store so when they went 'OOB', they weren't in the same area.
People that do that to save a few bucks are, IMO, pushing the line into being banned, or worse. It's retail fraud. It's using the policies of a retailer against them, and makes people that return things look like opportunistic frauds, criminals... Especially on 'high ticket' items with really low margins.
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As much as I like Best Buy, because of the wide variety of products that they carry and they receive the latest tech rather quickly. However, I have never been in a store where employees are poorly trained as they are. The knowledge, understanding of a product, are all considerably lacking. There are a few good employees, even the mere basics of general knowledge of some of the products they have in there is insufficient to even be working with a customer with.
And Geek Squad is no better and is rather comical with their training as well.
I was almost banned from their store (Best Buy) after overhearing a 'specialist' tell a customer an outright lie. I stepped in and corrected the lie, and had the salesperson get hostile and call for the manager, who swooped in, heard the bleatings of the sales droid, and my correction of their BS, and told me that he backs his salespeople 100%, but acknowledged the information provided by the salesgoon was 'out of date'. He asked that I do not interfere with their 'sales process' in the future, or I would be banned. I was shocked, the customer, by that time had left disgusted as I had proven my point, and the store didn't get a sale. I was embarrassed for the chain. It's not my job to make sure they tell the truth, and yes, they perhaps do need to die because of their BS. I never saw that manager again, high turnover. The 'salesfart' avoided me like the plague, even commenting that I was 'a problem customer' on one occasion.