mulegolf it's easier for my wife to notice when something is delivered bu UPS, FedEx or USPS. That 4' long box is pretty much evidence that I've bought another golf club.
When SWMBO and I got married we combined our incomes, but each of us created a separate "toy money" account. We each put the same amount in that account each payday and all toys are bought from those funds. Zero arguments on toy spending resulted. She still reserves the right to snark about the sheer volume of boxes going and coming. She may be right, I may be crazy, to quote Billy Joel.