You know what, regardless of what THEY say, I am thankful for having desires and for wanting things. We only desire beautiful things when we are healthy and feeling good. Once you get sick, really really sick, all you want is either die or get back to life, but you certainly don't wish for new shoes or a sports car - suddenly all fancy things don't matter any more, and all you want is health. So, all of the aforementioned makes me think that wanting things is healthy, therefore good for you. But just like with any thing out there, everything is only good in moderation though.