I didn't get any sense of being defined by it. It's simply knowing that a particular item you own will fulfill most criteria you find important in an item of that type.
For example, I own a Solo wood burning stove and an Esbit brass alcohol burner. I spent a few days researching them before my purchase, and I take them with me whenever I go on a multi-day hike. I did the same for everything in my pack. So now, if I ever lose my pack (a distinct possibility), I can build up a replacement and order whatever I need in less than an hour because the hard part (research) has already been done. On top of that, I have the peace of mind in knowing that my tools are unlikely to fail me in my time of need.
Of course, I sometimes make bad purchases even after researching, at which point I decide whether to replace it with something else, or accept its deficiencies.
It's not about price or status. Some stuff was expensive. Some stuff was very cheap. Some stuff I bought at the Salvation Army store. Some stuff I built myself because the storebought stuff didn't suit my purposes well enough. The cheapest item I own is a deodorant salt crystal that I bought for 89 cents and will last me for years so long as I don't drop and shatter it.
It's about choosing where your comfort level is with various "things". Sometimes the "best" is actually disposable or will break after a few uses.
I don't buy things very often, but on the rare occasions that I do, I research carefully first. That's not a definition of me; it's just something I do so that I can know where I stand with respect to the tools and items I use. Everything has a purpose that I can cite instantly, and if I can't, I get rid of it.