We have a rule at my house - you touch my scissors and I go buy a new pair. DH didn't think that was a big deal until I told him how much a new pair would cost. I bought him a whole bunch of cheap scissors and put them all over the house in various drawers, so now he uses them.
On a side note - a friend of mine got tired of her husband using her good scissors so she bought a bunch of suitcase padlocks. She puts the padlock on the handles so he can't open them to cut anything and the key is on a chain around her neck. Pretty clever idea.