It's not necessarily a bad thing to WANT something.
A desire only becomes a bad thing when it becomes an idol.
To put it in a less Christian way, it consumes you to the point of being unhealthy.
We should be grateful for what we have, though.
It's important to remember what we have and what others don't have, so that we don't take what we have for granted.
That can make it more painful when we lose it--and a grateful heart is a glad heart.