Grass is always greener syndrome. The obsession with other peoples' wealth and lifestyle. Thing is, you don't really know what goes on in other peoples' lives, very often, and you don't see the 'difficulties', issues and pressures they have to deal with. Quite often, the real picture isn't quite as idyllic as it may seem; you see people socially, when they're presenting their best image. They're still fallible human beings at the end of the day.
Our neighbours earn silly money. Both work in the City, for large corporations. Lovely house, lots of 'toys', etc. Very enviable to some, I'm sure. But both work stupidly long hours, have to give up weekends at the drop of a hat, or fly away for several days at a time, so rarely have time to spend together. The woman was recently mugged, and on reaching home, 'phoned her husband. He couldn't speak to her as he was in a meeting (this is gone 7pm). Worse, he wasn't even in the country. She's 4 months pregnant (I'm amazed they actually found the time to do that!). Her company have basically told her unless she comes back to work asap after the birth, and 'carefully considers her child-care arrangements', as well as more or less having to job share with another currently pregnant woman (so a hefty cut in hours), she won't have a job. Nice. So basically, for all the money they currently earn (no guarantees they will still have jobs even in 6 months, and they could both lose their jobs at any time), for all the gloss and sheen, their current lifestyle isn't all that marvellous. They envy us because we can take nice holidays, have frequent long weekends away, or even just go for a nice bike ride of a Sunday afternoon.
Sometimes, no; very often, less is more.