BookTenTiger
He / Him
This is just a loose idea, but here's my thought:What level of play do you intend to start with?
The question comes to mind that the PCs might reasonably have to spend most of their efforts protecting their wealth...
Initial Adventure (and securing of treasure): Levels 1 - 3
First Character Arc: Levels 4 - 6
Second Character Arc: Levels 6 - 8
Third Character Arc: Levels 8 - 10
Fourth Character Arc: Levels 10 - 12
In this campaign structure I think it would be more interesting to see how characters spend their wealth, and the complications and consequences of that, rather than protecting their wealth. So maybe the campaign world would need a solid banking system, or knights templar who protect treasure, or something so it's not an issue.