There is no secret that he Lampi DSD Komputer starts as a CAPS V4 Pipeline server, which you can get for @2800 from SGC:
http://shop.smallgreencomputer.com/CAPS-v4-Pipeline-CAPS-pipeline.htm
Add $200 for 4TB storage, and you are @ $3000. Then add $1000 in extra software (Win 2012 R2 standard licence, Audiophile Optimizer, Jriver), another $1000 in Jcat bits (battery PSU, USB card, SATA cables) and we are already talking about $5000. And that still doesn't buy you their custom settings and 24 months remote support.
Sure, you can get all the parts by yourself and put it together a bit cheaper than what Lampi is asking, but there are certain people who do not have the required knowledge, the time, or just want 24 months remote support. It also becomes a branded product, of known build and quality, which carries certain resale value.
I got dirty and have built one myself, but I do not think it is a bad deal at all. I can name a few more expensive servers on the market, that are far less elaborate and cheaper to build.