Also they should let internet radios on there and do the same because I have some smaller ones I listen to that don't support premium (higher quality/no ads) streams. All under the precondition they don't destroy indie internet radio culture along the way.
I doubt most people would be willing to do the same, however. So, an expensive Spotify would lose to cheaper alternatives.
But the crux of the matter is that most artists are willing to work for pennies; either for the small chance of future success or simply because they like doing it (it's just a hobby for them). There's an oversupply of "good enough" talent, undercutting everyone else (except the top 0.01% who are already rich and famous).
If you paid double for your current subscription, that would just put more money into the pockets of the biggest artists on the platform.
In the end its labels who pay the artists, not Spotify.