Why is the grass greener on the other side?
It's not the having, it's the getting. It all started when we were kids, and a friend got something new, and you wanted it too.. He was having so much fun with it, and you wanted that. If/When you got it, the first couple of days were great.. after that.. HE GOT SOMETHING ELSE.. the old 'whatever' was just that.. old. Now it was time for the next new shinny whatchamacallit that would keep you entertained. Ad infinitum.
Now you're older, and guess what.. Now you get to choose what toys you want to spend your hard earned cash on. (In some of our cases, with our wives permission *or without her knowledge*. Better to ask forgiveness than permission sometimes.) Anyway...
That's the way we've been programmed since we were young. Sometimes it's hard to over ride that programming, even when we know why we're doing it. If you were brought up frugally, you may not have this issue. I know a couple players that have had the same cue for ages, and have no plans to get anything else.. ever. But that's a rarity.
All in all... life is fairly short, and being happy in that life is a good thing. Do what makes you happy if you can. If getting a new toy makes you happy, and doesn't hurt you or anyone else in the process.. I don't see a reason not to do it.