Money not the issue. You could give the smaller populations gazillions and it would make no difference. There is an in-built inequity in population size and amount of players involved in club football, and add to that the exodus of young people from thinly populated rural counties due to lack of opportunity and the growing global trend towards urbanization. However, when you bring it up, you'll get the usual:
Sure look at smaller populated counties like Monaghan punching above their weight
Sure look at the competition larger counties have from other sports: rugby, soccer, basketball
Sure look at an Ulster county like Tyrone where nearly half have no interest in GAA for political reasons (the nationalist pop is still 5 x the pop of Leitrim)
Sure look at at counties with large populations and they are shite (Kildare, Meath, Wicklow, etc)
Again the likes of AIG could throw money at rural counties with small populations. It would make no difference. The system based on the English county system is unfair at its foundations. Money, however, is amplifying the issue and the only counties with a realistic chance of winning Sam Maguire are counties with a population of 100k and above. We are unlikely to ever see an Offaly 1981 again. So you'll have lots of counties that will lose more interest every year. There's a few like Ros where we are still a bit fanatical. But that will die too. However, if a Dublin, Kerry, Mayo or Tyrone win an All-Ireland in 2025 and the rest of the country doesn't give a shit, despite a glowing report for the 70 dying boomers who still read the newspaper, it will have about the same value as winning best turnip at the Strokestown agricultural show. And so passeth the glory of Sam.