What I was thinking and I missed to say is that whether to stamp or not my ticket, strongly depends on which bus line I am using.I live in Studentski grad,that's why my evryday lines are 102 and 94,and thrust me if you do use 94 regularly,I stronly reccomends to stamp your ticket or to by a card,because I doubt that you will be able to make 100 rides witout being caught at least 5-6 times,or even more.Still thinking about the issue and wondering whether I should change my attitude and stop being "moral" citizen.