I agree that when it comes to establish a relationship or choosing a playmate, there must be a certain attraction towards the other person.
And with attraction you can understand what you prefer: a nice figure, with expressive eyes, a striking personality …
Most of my slaves have always been pretty physically common (even some overweight and others really ugly), but I take the best from them all.
If they can seduce, amuse, indulge, pamper me and make me laugh, I enslave them! 
Yet from the other role, many of these subs who complain about not finding a Domme are often fairly superficial in their searches. Ah, no, no that one, she’s fat! Ugh, LadyWhatever called me bitch, what does that ugly woman think? …
A young and beautiful Domme is a marvel of to boast about, but also a fabulous mature Lady with experience and knowledge to get you to where you never dreamed you can.
I won’t say that you park your preferences to surrender (or dominate) someone who disgusts you, but sometimes we miss magnificent experiences that perhaps a beautiful sub is not going to provide.
Bah, I’ll take the surrendered and ugly slave; I’ll use the beautiful one a while to see what has to offer 