My life has been frequented by pessimistic people, who simply don't look at what they have. Coming from poverty I was grateful for any and every opportunity handed to me. Sometimes people just need to take a step back and view their fortunes. If you have a bed, a roof and a refrigerator your in the top 40% in the world in terms of wealth. With my viewpoints, I've had the misfortune of belonging to this generation that believes they are entitled to senseless accessories and commodities that are rarities in most regions. Even now that I'm bringing in substantial revenue I'm fine with not having a smart phone, $100 shoes or even name brand clothes.
When I went into the Corps, people simply liked being around me because I carried a humorous sense of optimism. Life is that much better when you look at most of your possessions and think "It'd suck if I didn't have that". I've come across many people who claimed they were "abused" when all they ever had were regular arguments and misunderstandings with their parents. Some people just need to know what it's like to stuggle. Whether it's financially, emotionally or physically to see how fortunate they actually are.
Of course, everything in moderation. This doesn't mean you shouldn't strive for a better life and success.