I'm thinking of getting rid of my old server mainboard (Supermicro x5da8, 2x Xeon Prestiona 2.4GHz) and for laughs I checked prices of those boards on ebay.

Shockingly, it seems that, somehow, there are quite some offers for these used boards at anywhere between 200-600 euro, while the cpus go for around 10-15 euro and the memory around 20 euro.

What is the deal here?
I mean, it was a high-end server board, but let's be honest: it is a 20 year old board.
Ok, it supports some obsolete standards (u320 scsi, PCI-X) that may be hard to come by on new systems, but surely those prices cannot be realistic?

Can anyone shed light on this?