link Aside from Miami Toronto Chicago Nashville at the top and St Luis Montreal at the bottom, the other MLS teams are quite close to each other in total salary... of course this doesn't show transfer fees
The problem with making definitive statements like "spending more money doesn't correlate to winning in MLS like it does in pretty much every other sports league in the world" is that they're heavily dependent on random events like, are Inter Miami and Toronto FC some of the best teams in the league this year or some of the worst teams in the league this year...