Yeah, liability. A paid wedding would probably require more than your basic homeowners insurance. Remember that people get stupid drunk at these things and then do stupid things and will then try to sue you when they trip over a planter or try to bust it open with their head. You’ll also probably want to enforce when the booze is shut off so that people don’t drive home DUI.
Maybe you could specialize in 2nd marriages for older couples? Then the festivities wouldn’t (you would hope) get so out of hand?