Here's the opinion, and it's mine and won't buy anyone a cup of coffee:
Vanity is vanity.
You can dress it up any way your mind wants to, but the bottom line is that you can be vain about wanting to be fancy or you can be vain about wanting to be plain.
This is the best definition of vain that I found:
Having or showing an excessively high opinion of one's appearance, abilities, or worth.The local Amish are failing big time at not being vain. They have an excessively high opinion of their plain appearance.