I was a "gun whore" at one point of my life. My thinking was that if I couldn't own everything I wanted at once, I could at least own individual firearms for a period of time. So I'd buy frivolous guns, shoot them for awhile, sell them, then use the $ to fund something else. I went through a lot of guns over a couple years, it was fun.
Then at some point training became more important. When this occurred, buying guns almost came to a halt. I ended up dwindling down what was left to fund more practical firearms, accessories, ammo, and training.
These days, my collection is more practical but I do tend to keep some fun stuff around. I've been blessed and have been able to shoot many of the guns I wanted to try, so the urge to buy frivolous stuff has faded significantly. I also hold various instructor certifications, which I value more so than my old habits.
So ya, been there done that....I have little to no regrets in it all.