Numbers are wrong - 11557 kills of HEROIC Ny'alotha to date.
Around 20000 kills all up (excluding LFR).
Also - almost everyone in classic raids, because there is SFA else to do.
Around 15% of WoW retail players raid normal or above.
So when comparing things, make sure you get your samples right.
Fundamentally - Retail is the better game, that's why far more people play it.