I try not to get unnecessary stuff, mainly because I can't afford to waste money, but also you don't need multiples of things, after all it's just greed.
Occasionally you get a second, if the first isn't quite what you thought you needed or wasn't quite up to the job required. Then I'd sell the old to help cover the price of the better/newer.
(No not another sob story) I've never had the best of things, it's just the way it worked for me. Bar mobile phones (which cost about the same regardless of model) I've never had brand new shiny things, I've made do. I do though, like shiny things! Maybe it's the "look how well I've done" physiological effect, I don't know, but yet I don't get jealous of those who have, I admire them, but if they have mulitples I just think how greedy.
Take my TV. It's over 10years old, the screen is going (there are colour issues and strange shadows coming diagonally from each corner) and it takes over 5 mins to turn on (you have to press the standby button for long time and then keep tapping until it turns on). I'd love a new TV, but a 2nd hand one will do the same job. However, there are schemes from council on white goods, but not TVs.