Good points. Looking at eBay, the sellers of used DDR4 seem to have caught on to the price increases and are asking for the same unpleasant prices. I guess the best time to buy more RAM was a year ago and the second best time for it is now.

My 5-year-old mainboard only supports DDR4. I'm just looking to increase my RAM and have two free slots available. But even the prices of DDR4 sticks have increased 100%-200% compared to a year ago.

They are more affordable than DDR5 sticks to be sure but still crazy.