I'm not going to share equipment at the gym
Why do you have a problem with sharing your gym equipment?
No, I don't want other people to ruin my equipment; I'm aware I should be respectful and clean myself.
I get that you want to have your own things, but gym equipment is communal. You and other people are expected to share it and keep it clean. You have no right to hog it from others and you may be kicked out.
Why should I care about other people? I know how to work that equipment.
Because people are paying for their gym usage, not just you. If you will not allow other people to use the equipment, then they will not be able to take advantage of the service that they have paid for, and you are the one taking that away from them.