AlphaStation 200/250 and 255 - ebay observations

Maybe some can answer this question. Every (it seems) AlphaStation 200/250/255 that appears on ebay ends up selling for more than what I *think* is a reasonable price. Maybe maintenance org's buying spares? Are they used by some telecoms? I used to have the 255's as Operator interface displays for process monitor/control. They used DUnix 4.0E and some apps from Siemens. I was able to replace them with DS10's with little effort. I can maybe see why a DS10 would go for a high price, but not the 200/250/255. AlphaStation 200 - mostly Alpha cpus @166 or 233MHz AlphaStation 250 - Alpha cpu @266MHz AlphaStation 255 - Alpha cpu @233/266/300MHz They were and are not _that_ fast and memory expansion is limited. I realize at the time (1995-1998) time frame these machines were very fast, but this is 2007, you could purchase a used DS10 or DS20 and gain alot of power for less money. Clue me in please,