If no one signed up then there would just be complete gym anarchy. The YMCA has a sign that says limit your use of the cardiovascular machines to 30 minutes. If you want more time, than get off your machine after 30 minutes and sign up for another machine. We are all adults. We should know how to share by now.
Sweat is gross.
I don't want to get on my machine all ready to work out and feel wet handles. They provide cleaning spray and paper towels. Just use them. Also, there is a designated walk lane and the rest of the track is for running. Walk in the walk lane.