[MENTION=79064]MMHS[/MENTION] just to be clear ... I don't think you are trying to imply that whatever the pay structure was during the 80s ( as Per Greenidge himself ... he got paid only if he played and obviously no contract what so ever ) resulted in same participation levels at the FC and lower levels ... Right ?
I would post that article but it is on Cricinfo ... but easy to locate through Gordon Greenidge's player page on CI .. scroll down to the link for articles and the first article dated Jan 2017.
He still kept playing because that was the best job he could do & highest he could earn. And he was picked because he was still better than others.
Regarding motivation, I tell you another story - once Kinshasa Bikele or Moses Kiptanui (or some one Kenyan world champion) was asked - what is the secret for Kenya to produce such wonderful middle distance runners virtually from no system or financial motivation; when West is failing to do so with best level facilities & finiacial back ups.
Answer was - one part is genetics, which we are born with; second part is the system - our kids starts day to compete with lions & gazzles & rhinos just to run for saving life; third part is motivation - an athelatics medal can give us a job in police or army which'll give us the hope to raise our kids in school, to feed them 3 times a day & to keep them under shed. On top of that an Olympic medal can land us in the dream land of Europe or North America.
Motivation in sports is a bit different than doing 9 to 5 job - it was always like that. Fortunately for current generation, it pays them in 8 digit.