I can relate. It's kinda my life. In forward. There have been times when I had to point out certain truths about where my money comes from and where the majority of it gets spent in order to get her to STFU about a purchase I made.
The events of the last year have made her somewhat come around as far as sheer quantity of certain things. Ammo, handguns, etc..
I really can't complain though, as far as things go she's been pretty understanding about my needs. And for the record I've always been the same way about guitars and basses and especially tube amps. She understands my tendency to intensely focus on narrow bands of things. And in the event that she no longer understands she is aware of where the door is.