There is nothing in the wallmart returns policy that limits the number of times you can return something.
As long as your return meets their return policy, I'm sure they will keep accepting it.Answer 2
YES, but not for legitimate reason. When I worked there, people would often get receipts from the trash can and pick stuff up inside and try to return it (they could get the sticker by bringing anything in and showing it to the greet). People would also try to scam on rotten meat to get double money back. These are thing we could easily spot, however, and these people were not allowed to return stuff after a while, but the first couple of times they got the benefit of the doubt. But just returning stuff, no, no limit. If you are returning stuff too frequently, you may look suspect.