Yes, it does depend on how much you're trying to hide.
But then no one cares if you're hiding 600, 900, or even 1,500 gold. Try seeing how much it would cost you to hide 20,000+ gold, on an ongoing basis. Don't forget to include the initial cost of building/expanding all those safehouses.
Tsk tsk, you should know that you can't hide more than 1800 gold (lvl 6). Yes I've built a society safe house that high, and yes it cost over 10k roughly speaking. The funny thing is that you can hire guards to defend the safe-house, which in theory doesn't need any guards since only members can see it. IIRC it takes 36 gold to maintain, I'll have to double check when I'm in the region.
The reason you can't hide more is to get to level 7 costs more than you can store in the safe-house. Since you can't use your personal funds in the enlargement, you are stuck at level 6. Though at level 6 you've basically taken over an entire city block for one safe-house.
