I mean, if you returned 287/602=48% of the items you ordered, either there is something wrong in what you order or - more likely - your supplier (Amazon) is not reliable.
On the other side, if 48% of items (particularly if low value ones) are returned, the costs of shipping/returning/handling must be enormous.
My point is that if someone like me can return almost half their items and Amazon doesn't care at all - then it's extremely unlikely the people are being banned from Amazon services for returning a USB drive.
As well another question is what is actually doing (or not doing) Amazon about the USB sticks/drives issues, the return rate of that should be something like 90% assuming that 5% of buyers fail to realize that the size is much smaller and - still say - another 5% buys them "for later use" and do not test them on arrival.
In a traditional brick and mortar store there would be someone monitoring the return rate for defects on any item for sale as - besides the loss of perceived reliability - there would be objectives costs for handling the returns.
Say its Wednesday night and I'm starting to design a project I'm doing over the weekend but I'm not done yet - and realize I will need 8mm shafts but not sure the length of my design. I just buy 3 or 4 versions of the product with the approximate length I may need and then end up just using the one my final design calls for and returning the others.
In a case like this, there is a problem with the customer, that's it.
I have 300ish orders per year, and not even 5% returns.
It's an incredibly wasteful way of shopping, it hurts the seller (which may not be Amazon itself), it hurts the environment, etc.
This includes some parts of fashion. You buy online. If it doesn't fit, you return and buy another. There are hobbies which are similar. You buy extra parts, and return what you don't use.
The price factors in the 50+% return rate. If they didn't allow returns, no one would buy.
I don't know if that's what OP is doing, but I'm not ready to judge unless I know it's not.
Still, since as you say these online sellers must calculate the prices of these goods to cover these return expenses, the other "normal" clients pay more and BTW there are thousands, millions packets going and returning (it is time, money, traffic, etc.).