Your confusion about pricing is understandable Ben.Fosi is confusing to me with these low prices in the world of thousandKs. I offered a Fosi amp to my sister with small Eltax speakers and it's impressive (Debut Carbon + OM5). The sound is really good and the whole system is cheaper than my cartridge and phono cable.
Those of us who've tried Fosi amps have been very impressed with the quality and value.
As you've found, good sound doesn't have to cost a fortune - although those that have spent a fortune will often disagree with that 👍