Don't see a problem with these little pick'em postings. Regardless of transition stage, body type, etc....ppl are going to have different preferences no matter what. The problem is that too many folks will go negative on the model they don't choose instead of highlighting why they like what they like. And this could be potentially bad for business, as Seanchai says.
As for the Top 50, I also see it as being very similar. I just ran a quick scroll. Well over half the Top 50 are big dick models. Since there's a minimum # of votes required....it's clear big dicks get the votes and are most popular all-time whatever as voted by more members. It's a porn site, not a beauty contest. Even if it was the "Top 50 Most Beautiful/Passable"....beauty varies from one viewer to the next.
A model gets 5 stars from me for alot of different reasons and I'm sure it's the same for everybody else. Body, dick, titties, ASS, looks, eyes, lips, performance in the vid.... Any one or more looks good/great/amazing to me, then....click!! Just another 2 cents.