If a player's getting an unfair advantage, either you A.) notice, and leave the server, or B.) don't notice, so as far as you're concerned the player might as well have gotten it through legitimate means.
I can see why you might argue for wanting to know, but personally if I don't notice that a player is getting an advantage, then it won't affect my overall experience (just in terms of having fun).
I am likely to be frustrated, however, by roving bands of admin-powered bandits. THAT will cause me to notice, and then the simple solution is to leave the server ;)
That's a fair point, basically if you don't notice it then it's not big enough to be annoying, right? Although, how can you tell the difference between someone that's been playing 8 hours for the past few days and someone that just had the admin spawn it in for them? I guess you could see that the guy has been playing a lot, but still, he/she could have been farming before you even started playing; so it would be really hard to tell the difference.