Not unless I sweat like a fucken pig. Which I dont. I wear a shirt and I dont sweat through it generally. When i get up the machine isn't soaked in sweat. But if you sweat like a pig, than yes, wipe it down, because its fucken disgusting.
I stopped going to an LA fitness here because the place was hot as balls, everybody sweat like hell, and nobody wiped anything down. Bunch of white trash fucks.