Surely whether they're pretty is subjective anyway? So pretty much irrelevant?
With my Mrs, at present I earn about 10x what she does. She's basically moved and missed chances to really progress due to my job, so I'm in the process of helping her realise her potential as well, as it's important for me, that she can do this. Not only for her to be happy and feel proud of herself, but for our shared dreams.
That's the most important part of it, ugly, pretty, poor or not. It's what you both expect and want out of life.