The "problem" is Birgir. He is the most prevalent builder with the most accessible choices. However, he is not the only builder out there. The focus has always been on, say, Stax 007tII or 727 and their entry pricing comparative to what a KGSSHV can be had for, which is the $2k-ish range. At that, you're asking a few hundred here or there for a HV build over a new or even secondhand Stax amplifier.