Some of us may actually have a justifiable reason, but for some it's just chronic that they whine about each and everything,despite obviously having so much to be grateful for.
Our Prophet(Peace be upon him)once said that a person who is content will find themselves the richest person in the world! Truly such a blessing to be in that state really.

That said there are many things, materialistic and otherwise, that I feel I am dependent on, BUT I know that was I to lose many among them of material things(as I have in the past)I'll probably just find replacements for them all. It's those more non material precious things that I really don't wanna lose. Namely : beneficial knowledge, the ability to practice my religion, my family, friends(even the virtual ones!) etc.