Well, I believe in love but I also believe in creating wealth/wanting to set up my future kids financially which won't necessarily work if only one partner is projected to make a good living. It would be much easier if both sides bring a significant amount of money home.
Now that doesn't mean it has to be a specific career but I guess one would look for a certain type of ambition in whichever field your in that also has growth opportunities.
So if I want to find someone who has a similar vision I'd need to look for someone with great amounts of ambition, buuut allegedly they only check for Miss Universe 2031 who will be at home sitting pretty?