They will get fucked up (under your boot) even if you never fall, but its not absolutely terrible. It is rare to catch an edge and rip it out since most of the rails, at resorts at least, have been 'polished' by the millions of other skiers and boarders. That and most high class parks should go over their rails with files, not sure if they do tho?
'I would be embarrassed to constantly complain about my life considering all the freedom and opportunities we have today. People that can't find anything they enjoy in life simply aren't giving it a real try.' ~Nick 311