A very sensitive topic apparently. Some people feel it is ok for customers to abuse the system, others do not. Those of us who have been around have seen companies scale back their generous policies when abuse happens. While Apple does make billions and billions, the more people that abuse the system will tilt the scales and eventually cause change.
4-5 times is crazy. Does Apple allow this? In some circumstances, yes. I've found also being really nice to the Apple Geniuses - they'll go WAY out of their way to help you - beyond reasonable. But to abuse that will eventually cause that to be changed.
That and I've seen enough posts here on Macrumors that love to jab at people with the # of times that they've returned a product for replacement. It happens every year. I usually try not to be an ass but... imo, 4-5 times is not helping anyone and eventually will encourage Apple to change their really awesome return policies - and we all will suffer for that.
Like when OneDrive offered Unlimited storage. What did a few people do? Started uploading many hundreds of terabytes of system backups. Then what happened? No more unlimited storage for anyone. Yes, you can argue that Microsoft was at some fault... but when people abuse what is reasonable...
Granted, I've returned a few products in my lifetime (3-4?). But I've never had to go beyond 1 round of replacements. 4-5+, in my mean, horribly unprofessional opinion apparently is edging on abuse of the system.
Not trying to start fights, but in the end, it will result in less for everyone.