Dirty_Player, for example, I didn't play anywhere before the Novice-2011-Summer tournament. I mean, I didn't play ANYWHERE, just at home on my computer + I watched replays/streams/analyzed various saves. And I took top-3 in the tournament. And only then did I start playing actively with people. And if they had set a condition for me - 10-15 reports, then I could participate in the tournament - I would have continued to just watch, 100% I guarantee it. And I'm sure I'm not the only one.
Cheating, in my opinion, is not such a widespread phenomenon that it requires preventive measures. Sufficient punitive sanctions are enough...