In your recent response on the PG Can we talk thread you said scaling would be bad to the end game. I think that does hold some truth, but with the current balance, players are and will continue to leave the game.
My suggestion for scaling gold is this.
Levels 1-300 stay exactly the same as they are now with no changes.
Levels 301-400 all items get a 1.5 multiplier
Levels 401-500+ get an additional 1.5 multiplier.
For example: Legendary Egg token drop is 3000
Levels 1-300: 3000 egg tokens
Levels 301-400 : 4500 egg tokens (30001.5=4500)
Levels 401-500+: 6750 Egg token (45001.5=6750)
This would not change anything for players under 300, but would give players below this more of incentive to reach this level. That motivation could lead to spending to get to the level quicker. In theory this would be build a bigger base of mild to moderate spenders for PG. Still with the 1.5 multipliers after level 300 and 400 it does not significantly throw the end game out of whack and players will still need to grind or spend to achieve meaningful dragons and buildings.
I know some end game players wont like this because it not a huge boost in scaling but Im being realistic and understanding that Pg has to make money. I think this could help balance things a little bit in game and put money in Pg pockets.