I respectfully reject your premise. I don' think yours is a condition that requires a pop-psychology diagnosis.
You like gear and you like music- so what? How is this any different than a mechanic buying the latest Snap-on tool when the tool truck comes around? It's not- both are tools that make your job easier and more efficient. Both bring satisfaction. Both have long term value.
I say "Cheers! Enjoy! and Congratulations!"