Pretty straight forward. My niche has one other major player who is not complying with Adsense TOS. His site is clearly made for adsense with about 10 ads displaying at one time. Would you rat him out for the sake of being first?
You can do that. But it will make you "less of a man". Since you don't know exactly how much money he is making compared to you, then you want to rant him out not because you genuinely care about the "rules". You just can't bear the thought that this guy can "possibly" be earning more click revenues than you. And that, my friend, is an action motivated by greed. Just my $ 0.01 cents.