Not your property why would you care. How about your best friend owns a room. Customers have drinks on the rail, are sitting on the rail ....would you tell your friend his tables are at risk
LIke I said, if they are damaging the equipment then I will say something directly to the people. If they are not damaging the equipment then I won't say anything.
Now, if my friend does not allow people to sit on his tables then I will tell his staff to take care of that only because I feel a sort of managerial connection since I also owned a room and wanted it looked after when I wasn't there.
We have a difference of opinion here. I don't think sitting on a table damages it. That's my own observation, I could be wrong but having owned 15 tables I have never found that any of them were damaged by myself or other people sitting on them. Maybe we got lucky.
Of course I have often heard that sitting on tables harms them and I suppose that out of the millions of tables and millions of ways to make tables somewhere a table has been damaged by someone sitting on it. I just have personally never experienced it. But as a general rule I don't encourage it, I simply don't think it's enough of an issue for me to accost strangers over it.