[quote=@BBeast]
If our concern is people abusing the system to gain more power, I have a fairly robust and simple solution. Cap the amount by which a Holy Site can be upgraded/repaired to 2x the original cost, measured against when the Holy Site was first built. This prevents the exponential growth scenario, isn't too overpowered so as to not encourage it too much, while still allowing people some room to renovate existing Holy Sites and repair them whenever necessary.
[/quote]

That works pretty well, actually. I'd be happy to have that instated.