What we do on our leases is say, if you shoot it (meaning buck), then you must mount it. We all have agreed about which taxidermist to use and he charges $450, so that at least makes a guy think before he pulls the trigger.
I had a "buddy" in 2008 kill a small 1 1/2 old 5 pointer. He said he was not going to get it mounted and he knew the rule. I did not get upset, I just told him he hunted his last day on any of these properties if he did not mount it. He did not mount it and while we still hang out and shoot together, he has not spent a single minute in any of our stands since then.