I buy basses, I build and assemble basses, I sometimes sell basses. My wife buys art, shoes, tons of stuff for her wonderful garden, art supplies, and paints. She almost never comes to my gigs, just not her thing, is never jealous, and is happy I go play. I support her art and events. I realistically know I need to sell about ten basses, but it is hard to sell basses you built (emotionally and just name recognition). I also realistically know I buy basses and parts I could do without, but we are financially OK, i'm not robbing the water bill to buy a bass.
Bottom line, hiding music gear purchases is no different to hiding computer part purchases, shoes, purses, games etc. If you are buying gear you don't need and can't justify by making money from it, and your family is doing without as a result - stop. And don't hide it regardless.
I'm sure I sound supercilious but I include this in the sphere of growing up and being an adult.
Someday I will do a production run of the a few of the prototypes I have built and maybe I will actually make some money from building basses.