Twinklestein I know what you mean about Aljaz, he is simply the best looking man on TV for a looooong time, however, although his fiancee is not perhaps identically beautiful as he is handsome, she's still broadly in his 'league'- which is hot, female, thin, dedicated, superfit dancers. Now within that, he's clearly gone for someone he gets on with well, but he didn't go with someone much larger (which may be an issue for dancers who are obsessed with exercise) or with flabby arms, or who is a bit older etc. Dancers like and value other dancers' attributes, once you get to top competition level, surely they are all in a similar league, even if we personally prefer one to another looks-wise?
If there is a huge perceived differential, such as with Hugh Jackman and his older not as conventionally attractive wife, this is commented on a lot, and suggested there may be other 'assets' at play (in his case, that she is a beard).
In general, I think people do mostly maximize the type of person they go for- so looks, intelligence, body type, employability/wealth and so on, and then pick someone they like personality-wise within that.
As for those saying no-one is out of their league, I felt like that when young, but now older, I see that the hot young men I liked in my youth simply don't even see me anymore, so not only am I not in their league, I am not even in their line of vision (and am now in the line of vision of all the 60 year old guys even though I'm mid forties)!