I don't put much value in most of my material things. The things I have that I value the most are my house and my car- and my clothes. But I have more then I need, so that is just an afterthought. My house because it provides shelter for my family. My car because I live far enough away from things that walking pretty much impossible. But I don't have to have the newest, best car. Ours isn't. It's nice, yes, but it isn't the latest, greatest, most high tech one you can get by any means.
I do think that some people put too much value on material things. I think a lot of people equate material things with self-worth. They need the things they have to feel like they are making something of themselves. They need to show it off so they feel like they have accomplished something. I don't put that much stock in that. To me, accomplishment is hearing my kids say a new word, or counting, or doing the alphabet. It's knowing I have enough to pay the bills, and keep my family afloat.
It's the relationship I have with my hubby, kids and other family that matters to me. Like you said, we can't take it with us when we die, but the relationships we have and the way we treat others will be.
In todays world, it's hard to not see all the wealth and prosperity and not want it. To say that I don't look at someone that has more then I do and wish I had it is wrong. Sometimes I do. That's just human nature. But I try to keep things in perspective, and know that I have what I need and what my kids need. That usually pushes those thoughts out.