For the record, I owned roughly 10 different macbook air 13 inch laptops for around 110 days, returned them every 11-13 days, and bought another one either in that same trip or the next day. Not one of them every had any problems, and apple happily took all of them back, and it was usually even the same clerk who helped with the return process. I told them plainly, "It's an awesome computer, I'm just not sure if I want to keep it yet. I plan to buy another one very shortly." They would respond with "No problem!". I ever asked several times, "Aren't you guys going losing a lot of money every time I do this?" and they usually responded with "Apple has plenty of money, they don't need more money, but they do need more satisfied customers."
Apple DOES NOT care if you do this type of thing. I used the same CC and Apple ID every time, so they could easily have cut me off if they wanted. Ultimately, in the small chance that I end up keeping (or forgetting to return) #10 or #100, they have just gained a customer who will ultimately spend a lot more on them in the future (in software, accessories, and future computer purchases). And that totally worked on me, I will give them more of my money in the future. Also, Best Buy has a 30 day no questions asked policy on most stuff and 14 days on things like laptops (or if you are a platinum rewards member like me, its 45 days on everything). If you frequent BestBuy as much as I do, you could easily keep a product for a year and never pay for it. (and yes, I have done that before).
If you want to say "You shouldn't do this, this is unethical" keep in mind that I am not stealing from anyone, hurting anyone, or making anyone's life worse. Maybe best buy loses money off me personally because I return stuff too often, but they gain a lot more by allowing for this system (like getting me in their store every few weeks to look at all the new stuff, getting advertising on forums like this, keeping me loyal if I do need to buy and keep a product, and plenty of other things) If their stuff is too expensive because "I drive prices up by returning stuff a lot" then quit complaining and don't shop at apple or bestbuy. Go buy from a store that has lower prices because they don't allow returns. If no such store exists, sit down and think about why that is...
Can't wait to hear some feedback about this.
EDIT:
And whoever said it was "unethical" to want to return a laptop to save $140 dollars from tax, you are either stupidly insane or insanely stupid.