Sorry, that is not how it works. I'm not sure you understand supply chain economics at all or how a specific type of customer experience results in increased profitability per customer which is better for the company, it's employees and contractors (and all other customers as well).
If someone has a return policy saying I can return something within a certain period for any reason, then it's not unethical for me to do that no matter what. You make it sound like I bought and returned 50 computers or something. I didn't return everything I bought, I kept the most expensive item (the iMac) and I returned the Retinas for now because they're ***** stuttering/lagging on scaled resolutions. I'm NOT going to keep an item that isn't working properly under any circumstance, period.
Not to mention I buy about ~20 Macs per year for myself and employees and might happen to return maybe 1-2 when something doesn't work out. It's rare that something isn't up to par.
I guess what you're saying is I'm a bad customer. I think Apple and any other person with any sort of business intelligence (or common sense for that matter) would disagree with you.
Not to mention how many sales I've driven to Apple over the years due to specific policies like these. Doesn't matter, there is no discussing things with folks like you who don't look at the larger picture, or the simple fact that a policy is there for a reason.