Would anyone be scared of doing it if the height was 25ft instead of 250ft?
Of course the 'scary/stupid' bit comes in the fact that whilst the risk of falling is the same, the consequences are quite different.
I can happily walk a 10m tightrope at 1m off the ground, but take me 10m off the ground without a net and I can't even make 3 or 4 steps - even with a safety harness on.
What I'd like to try is a bungee jump, but rather than one that drops 100m from a 150m bridge, I'd like to do the same 100m (or greater) jump from the edge of space or something!