I knew of this from a relative in retail. If you are someone who constantly buys things - especially on sale - then returns them, a retailer has the right to no longer sell to you. At some point, all the time and effort involved in processing return make it simply not worth it for them to sell anything to you in the first place.

It makes sense if you think about it.

This only applies to "habitual abusers," not someone who normally buys stuff, but occasionally needs to return things.