It's always room for improvement on any service, but it's not really fair to complain that a service costing $10 a month is not suitable for critical classical listening on a stereo that cost $10.000.
Best step IMHO is to push more online music retailers to sell lossless files for critical listening or maybe Spotify could sell it, hopefully for more than $10 a month.
Eh, my stereo equipment didn't cost anywhere near ten grand, but I wager it can still show the difference between 160 and 320 kilobits of compressed music. From what I gathered from the op, though, it's not so much about the practical difference than the fact that he feels he's paying for something he's not actually getting - and that's something that is fair to complain about.
Best step IMHO is to push more online music retailers to sell lossless files for critical listening or maybe Spotify could sell it, hopefully for more than $10 a month.