I’ve asked for cash on collection in the past, if it’s something they’re collecting they might as well bring the money, as already mentioned it saves the tax they call paypal fees. I had a buyer pay via paypal for a bike once, so I just asked them if they’d mind bringing cash on collection & refunded the payment, to be honest I always pay cash if it’s something I’m collecting, you have the chance to inspect whatever it is you’re buying so it seems fair to me.
Check their history of you’re worried, just keep your wits about you if you’re going to collect.