You are wildly ignorant of what professional hockey players were paid back in the day. By your reasoning a lot of professional hockey players in the lower leagues and Europe today are not professional players.
Way back, many players made a full average household yearly income during the hockey season alone.. and then had a summer job more for something to do and/or promotion work than necessity. The stars were making several multiples of the average family income at most times.
I don't have all the figures at hand but this site appears to go into many of the details:
Even in the professional sport’s early years, star players could earn salaries that tripled what the average American worker earned. As earning potential
www.expensivity.com