The memory in the PC I put together early last year is now worth about three times the total cost of all the parts I used to build the thing. It is absolutely crazy.
Memory is still a commodity product, in that there isn't a huge amount of difference between vendors selling products that comply with a certain technical standard. Sometimes the prices of commodities (wheat, silver, crude oil, etc) go way up when supply and demand get out of balance.
I'm still flying under the radar with a Dell Precision T5820. 128GB of DDR4 and a Quadro P4000 graphics card (8gb). Handles everything I need it to do including photo/video editing, and some random FPS games without any issues.
I was thinking of upgrading the video card to something better, but looking at the cost of replacing that Quadro? I might just stay put for now. Costs on those have also pretty much doubled.