I agree: Depends on the camera.
These days, not much. $50 is my limit.
My most expensive film cameras:
-- The new Zeiss Ikon rangefinder (new)
-- Zeiss Ikon Contaflex TLR
-- Zeiss Ikon Contarex Hologon Ultrawide
I bought them to use, not to fondle.
Before it's all over, I would still like an Alpa.