 If you return too much stuff, Amazon is known to cancel customer accounts. They don't say exactly the grounds, but the general thought is that if you return 10% of what you buy, you will get a warning letter from them. Abuse it and you'll lose it. Get tech smart in just five minutes with my free newsletter at GetKim.com. Sports at 25 and 55 brought to you by Amentum. Solving what's next. Engineering a safer, smarter, cleaner world.