In my experience, I have found that it's those who have the most who usually have the biggest sense of entitlement and want even more. I've done alot of volunteer work in my community. Many of it with families. A few years ago, I worked at a community center that offered free vision screening for lower income children. My job was to entertain the kids while they waited to see the eye doctor. I had so much fun with these kids (and I'm not usually a kid person). We played games, colored pictures, read stories, etc. These kids were delightful, and their parents (many of them single moms working low wage pink collar jobs) were so grateful that we were helping them out. They thanked us and made sure their kids thanked us as well.
A few months after, I worked a special Halloween party at a local children's museum. Two of my friends are directors at this museum and asked me to work at the arts and crafts table. This party was for the museum's members who for the most part are very well-to-do.
I was absolutely appalled by the behavior of these people. They didn't thank any of the volunteers or staff, referring to us as the "help." They let their kids run around screaming, nearly ruining the museum exhibits. Then they began to steal art supplies from my table. WTF? Surely, they can afford a box of Crayolas at Target, right? Actually, they just had a huge sense of entitlement and thought everything was theirs for the picking. I couldn't tell them to stop it because the museum relies on their membership money and these are exactly the type of people who would write a letter to the museum board trying to get certain people fired and I didn't want to put my friends' jobs on the line.
However, I refuse to ever volunteer for the museum ever again when it comes to dealing with the members.