I'm afraid you simply don't know what you're talking about. You are very wrong about this. Very, very wrong.
I don't know who you are referring to here but yes, of course, some were financially successful. Most needed to take ordinary, low paying, jobs after their careers. Some in England are supported by welfare grants from the PFA,
Twas ever thus and trending toward the situation we have now. How do you suppose the super clubs became super?