There was a time around 2016 when DDR prices went through the roof and didn't go down for quite some time. There were a lot of market factors: Samsung's massive Note recall meant they needed a lot of memory for their own devices, plus they had contractual burdens to meat for people who had already paid for RAM, so everyone else got screwed on chips (Samsung, Micron and SK make the majority of memory, and their pipelines all had shortages).

We even saw priced for old DDR3 chips go up as well as people were trying to reuse older board for non-CPU intensive stuff.

So tech prices don't always go down. They usually do, but sometimes market demands cause shortages and even non-vintage/collectable old tech can go up in price.