As much as it sucks, I think the value of so many superficial pursuits is to only end up "more valuable." It's why people exercise and buy trendy clothes that don't even look good.
Sure, but animals do it all the time:
Why do you think female elk consider the size of their mate's antlers before mating?
Why do you think female peacocks are bedazzled by the colorful feathers of their male counterparts?
Why do you think female guppies pay special attention to the gaudy tailfins of male guppies?
[I could go on and on...]
I know we as humans try to be as idealistic as possible, but this is something that we can't escape. All livings things strive for a successful life, (i.e. high survival, high chance of reproduction, emotional support, financial support, etc). And part of achieving this requires attaining a partner that can help in these pursuits. You won't be attracted to something that's not going to improve your life in some way.
Also, becoming more "valuable" doesn't necessarily mean exercising or buying trendy clothes. In fact, I'd say it's the weakest way to do it. Accepting yourself and becoming more confident with your abilities is the most attractive thing you can do. Because part of being more valuable is BELIEVING you're more valuable.