Back to the question in the OP's subject line, as a hobby, audio has a long tradition of spending lots of money on fancy equipment in pursuit of the last bit of performance. In my experience, the video world has never had the same rabid level of enthusiasm.
Audio enthusiasm has many factors -- snobbery, exclusivity, appearance, brand loyalty, debates over (often theoretical) technical aspects, subjective sound quality, component matching/synergy, and so on.
Those factors are just as true for digital streaming as they are for amps, speakers, turntables and so on. I'm not in the least surprised that that there are some very expensive streamers out there with plenty of enthusiastic followers.
Me? I'm perfectly happy with my RPi 4 and its USB output to my DAC.