I don't know what the limits are precisely, but I think it's something like this:
< 100.000 euro current capital = poor
100.000 - 400.000 = normal
400.000 - 1.500.000 = rich
> 1.500.000 = wealthy
I don't know if there are more classes.
I think 70% of teams "never" gets wealthy. No popularity, no bigger stadium no more income, just outcomes increase.
I can't find all categories but I remember i had to translate at least 6 different category.