That kind of budgeting can only lead to her shopping expeditions using a similar logic:
1. Get a hairdo - buy new diamond earring to match
2. Buy a new dress - buy a diamond pendant
etc
etc
Why not simply "budget" and set aside a monthly agreed amount after discussing it with a spouse? Isn't that what marriage is about amongst other things: talking to each other and not hiding things?
Half the tools lots of people buy they really have no need for beyond the one DIY job they are doing. For example unless you are going to be constantly putting up chairrail, basebaord, trim, crown molding, why even bother buying a finish nailer/brad nailer when a hammer and a nailset will do the same thing. That's $$$ that could be put towards a better tool you'll use more often.
I am sure the post was meant in jest, but unfortunately it rings true in many households these days. Our wives to a large extent are supportive of our hobby if they don't actively participate. If they're not, then furtively hiding acquisitions whether they be tools or new parts is only a recipe for disaster in a household.