No.
That is a good one. I was one to take my tests on my own. Several classes I took had massive amounts of cheating. In a couple instances i would say it cost me my grade. I had one class with group take home tests and homework, the catch was you were limited to the time you were supposed to spend on tests(2 hrs), and groups coulnd't intermingle. Of course my group followed the rules(I will say i was willing to fudge the rules but other group members were not, it was there last semester and they were set for grad school) and we did extremely poorly on the assignments. I ended up with a C, had we cheated I could have easily gotten a B, maybe even an A. Cheating is a real bitch when it hurts others. I never said anything to the teacher or anything, and after a couple of semesters he wisened up and changed some of the policies. But i was already screwed.
Wandering eyes isn't too bad, but if it gets to the point where they start passing around cheat sheets and even mouthing answers and pointing it is just insane(insane how bad they are cheating and how incompetent the test proctor is). Still there aren't many instances were cheating will effect alot of grades, to do that it has to be on a pretty large scale(see above).
But snitching is a really frowned upon thing, but there is a part of me that wishes i would have done something about the instances i believe hurt my final grade, especially now that i want to go to grad school and that C is starring back at me. When grades are based on curves, it just ain't fair.