Development of leagues is not solely based on salaries paid. It's about quality of clubs, infrastructure, fan services, attendances and much more.

>The main reason I had Germany below those two however is because of how much Bayern dominates. In Italy you have 6 very competitive big clubs, in Spain you have 3, in Germany you just have Bayern Munich.

That's when you only look domestically. But we have CL, EL, Conference League to look at how they do against each other and even if Bayern wins every domestic title, the other teams in the Bundesliga still do well internationally against Spanish and Italian clubs.