Abbas is trying to plug the leak in the only area where he has some control, but systematically stays execution of those who do sell their land to Israelis. In Israel the problem is solved under the capacious carpet that is the JNF. If enough powers-that-be object to Abbas's current way of doing things, one supposes that that is the road Abbas will take next. All boils down to the same thing though.
12 Iraqi troops, militiamen killed in multiple ISIS suicide attacks (AP)
from the article: PA court: Sale of Palestinian land to Israelis is punishable by death