When you refer to "leagues" do you mean looks/appearance?
Everyone ranks everyone. Tom is a better friend than Max. Sally has a more attractive face than Marry. Bob is less intelligent than Mark. Diana has bigger boobs than bonnie. Etc, etc.
On an individual level people prioritize what they like about another person based on who they are. However, on a general level people as a whole have a tendency to rank people based on a general trend. For example looks, most people on fashion magazines are attractive based on looks. Yes, some people may disagree but they are the minority. Women in general are ranked based on looks while men in general are based on competency.
There have been scientific studies that shows women are very good at picking up clues that shows how high a mans "social ranking" is. Basically, his "confidence". It could be how he walks, the subtle way he talks to others, his ripped cloths that are actually very expensive, his personality, etc.. he doesnt even need to be standing in front of an expensive car.
I actually don't believe in "leagues" for that reason; looks/appearance is so subjective. And for many women, attractive women, including myself, a man's vibe/energy and attitude trumps looks anyway. And how we vibe together.
Not to say physical attraction isn't important, it IS, but again it's so subjective.
But this notion of leagues, below my league, above my league has always confused me, it sounds quite shallow imho.
In older societies, a league would be social class. In the past, the higher the social class you were the more handsome/ beautiful that person would probably be because they had better access to food, medicine, etc. They didn't have to work in coal mines all day or walk in the hot sun to get the water or clean the cloths.
Today's society, things have changed, but there are vestiges of this. We still like healthy people, symmetrical faces (which signifies health), etc. Girls still like guys who are healthy and can provide resources, etc.
There are leagues... perhaps it's a mental thing, but don't expect a supermodel to date an average joe... and don't expect most wealthy men to date ugly chicks. Granted it happens every now and then, but it is an exception rather than the norm.
If you can relate to another person, have similar experiences and have the same level of physical attractiveness- u guys are likely in the same "league".