I don't think that's vain at all. But probably 'cause I'm the same way :-P
I care about the number on the scale, only because I still weigh so much and have a long way to go. But I've also struggled with staying on track these past few weeks, so I try to focus on how I look and feel. I have a much healthier relationship with food now and still manage to dress and look pretty darn cute despite being 300 lbs

I find that I'm more successful with WW if I have a healthier attitude towards ME and not just food, regardless of the number (if that makes sense)