It is Best buy's Policy.
Not mine.
I asked before I bought it.
50.00 restocking fee.
And a 30.00 upgrade fee is a lot of money to try out a phone for 13 days .
The phone is in a OtterBox case.
It will not have a scratch on it.
Not will it be dirty.
You won't be able to tell it was ever used.
The policy is there for people who want to keep the device, but want to make sure that they don't end up with something that doesn't fulfill their needs. It's not meant to keep someone occupied while they wait for what they actually want.
It doesn't matter if it doesn't have a scratch on it when you're done with it. It's illegal to sell something used as new, that's fraud. And since they can't sell it for the same price as a new device, they take a loss. They could try to sell it for the same price, but if a customer sees a used device and a new device for the same price, they'll choose the new one every day of the week and twice on Sunday. So if they want to actually sell the device, they'll have to put enough of a discount on it to make people consider it over a new device. Generally that means a pretty steep discount.
This loss on used products isn't isolated to mobile electronics. Drive a car off the lot, and you instantly lose anywhere from 10-15% right there.
Once it's out of the company's hands, they can't attest to what's been done to it, and even with a full inspection, they still can't call it new, that's just how it is. The problem is if too many people abuse this, companies have to do one of two things to mitigate their losses. Either they discontinue the program, or they raise prices to cover their losses. They can try to write them off, but at some point it doesn't fully cover their losses.
You mentioned companies abusing their customers. Well customers can abuse the companies as well. If you had spent a great deal of time bidding a job for a customer, and they took that bid to a competitor so they could match or undercut your price, you wouldn't consider them a great customer would you? The time you spent on bidding that job is lost revenue, same as the money they lose when they go to resell a used device.
The way Verizon does their discounts now (bill credits instead of a one time discount) was due in part to people abusing the system. I remember regularly reading people who would get the discount (which required them to sign a 2 year contract) and then cancel their account, pay the ETF, and keep the phone, which resulted in a loss for Verizon. So to mitigate their losses, Verizon decided to split the discount over a 24 month period, ensuring that if the customer tried something like that Verizon wouldn't take the financial hit. In your case, they let you off because you planned to upgrade and stay with them. Had you tried to get your full discount with the intention of leaving afterwards, they wouldn't have granted it to you because you would've essentially broken the contract and they would've lost any further revenue from you.
In closing, it may be their policy, but you're not using it as intended. And if enough people abuse it, it will either go away or their prices will rise. They're offering it as a service to their customers, but if said customers abuse it, the bean counters will step in and make changes. But in the end it's all about intentions. They're offering the tryout period to ensure that you're going to be happy with your product, not to keep you from being bored or to help you learn how the OS works.
PS. You said you asked them about their policy, did you say you had no intention of keeping it? Guaranteed if they still let you take it, and their manager found out, they wouldn't be employed their anymore.