One of my very wise fishing buddies made the simple observation that most fishing equipment is designed to catch fisherman, not fish. I think about that little gem on a regular basis as I am involved in a number of fun activities where I could easily spend way beyond my means (much to my wife's dismay). I play music (easy to drop $2K on a decent bass or $300 on an effects pedal). I read (and collect) history books and most of the topics I enjoy are only published by university publishing houses (not cheap). And then there is gaming. If you are reading this post, you need no explanation as to how easy it would be to drop a couple hundred on gaming stuff.
I have lived with myself long enough to know that when it comes to music equipment, books, and gaming stuff, I can very impulsive. Nothing like walking into a music store for a $10 instrument cable and walking out with a $600 guitar. Working in the nonprofit sector and having kids in college requires me to be bit more responsible than that.
Back in Minnesota, I would look at the fishing tackle and ask: (1) Do I actually need this to catch fish? (2) Do I need to buy this today or can I think about it for another day? I do the same thing with gaming stuff. The fact is, when it comes to gaming, all you really need is a set of dice, a pencil, and some blank paper.
It isn't that I don't ever buy gaming stuff...I do. And sometimes I buy a lot of it. And sometimes I buy things and then think the next week, what did I need with that? But I do try to avoid that sort of buyer's remorse. I think the main thing is knowing myself and not necessarily trusting that overwhelming urge to buy the latest game product. I try to only buy things I know I will actually use in the next six months.
I use online wish lists to keep me from online impulse purchases: When I feel the urge to buy something and I cannot think I will immediately use, I put it on a wish list and give it the highest priority. Almost always, I find myself going back to that list a month later and lowering the priority. My online wish lists are filled with thousands of dollars worth of stuff that I thought I had to have but then discovered I didn't really need. I figure I get the fun of shopping without an attack of buyer's remorse.