Yup, because they are scarce, and have ramped up 10 fold in cost

It's much cheaper for them to return 'part' of your hard earned cash, than send out replacements, as they can make a 'killing' for any stock they now have @ inflated prices, rather than lose, by replacing your defective product
They also benefit from the probability, as in this case, in having one RAM chip perfectly fine sent back to them, and should the same occur again, which it will, then these can be paired up and also sold @ ridiculous cost

They can't lose.
Even just sold individually, they will get their refund pay-out back, and then some. They will also be very happy for you to order the product again, at 10 times the cost, as you are desperate to get that RAM back for your system, and so the cycle will now repeat.
When buying anything today, there is only a Guarantee that you will get your money back, if it goes faulty, and should the product you initially bought, jump 10 fold in cost, don't expect a replacement, for the reasons above.
Different world now.
My example:
Just before the UK heatwave started, I got myself an air conditioning unit @ £350.00, long before I thought I was going to really need it. After a month it packed in due to some sensor rubbish, anyway, I initiated an RMA with a replacement notice, and was accepted. I waited 2 weeks, and nothing. Heatwave hit, and the sales of these things went through the roof here, couldn't get hold of any make. They contacted me, and said they couldn't replace unit due to this fact, and refunded me in full. Fair enough I thought, as I'll just buy one elsewhere.
Same place was now selling them @ £950.00, lol, plenty in stock, funny that?

, but they had none to replace my item? Needless to say, I gave up and never bought one, but there ya go
