From what I've read, it is a good sounding amp. However, I never liked how it looks and was surprised they would sell something so "bling." That is my guess as to the sales. Or perhaps the Monster name isn't working in this field?
Anyway, I believe they still make money even at this price, because Monster markup is always very high. You can't compare the price it sells at to the MSRP if the MSRP is way out there. You should compare it to the value of product and comparable products.