i don't care. really.
i always keep my machine under something protective, and let it go. my machine is public domain, unless i specifically need to use it for something (counterstrike, anyone?

if someone spills something into the keyboard, big fvckin deal. i have about 9 or 10 at home. my mouse is optical, so only heavy slamming can do it harm (i -would- intervene if i saw this, btw). apart from that, anything goes. no problems yet..
however, my perception would probably be different in a HUGE lan environment (100+ people), where i didn't know everyone.