I just returned two Warehouse Deal GPS's, in a row, because both of them were not the ordered items -- both being cheaper models. Number three was the charm.
I'm sure this was a statistically unlikely coincidence.
It may be that there are criminals out there who are defrauding Amazon by return-process shenanigans. And it may be that there are more criminals committing merchandise-exchange fraud than than there are honest people experiencing two-in-a-row shipping errors.
No email yet. But I think that Amazon is allowed to send me emails. They are even allowed to say that they don't want my wife and I as customers. So long as it is based on their actual business experience (rather than, say, my race, or religion, or political views), I can't see what would be wrong about that. Given Amazon's low profit margin, there may be a limit to how many returns they can afford to accept.
I judge a company by how their treat their employees -- especially their lower paid employees. I also judge book sellers on freedom to read issues. How they treat unprofitable customers seems to me morally neutral and their business. I realize that others here look at it differently