How do you calculate the true value of household items?

In this century, guys have no say HAHAHA

#HappywifeHappylife

Jokes aside, it's good to balance functionality and looks for furniture, so this 2 points can justify the value of it. You can try basing your arguments on this. Then again, if my wife thinks it's too expensive (which it likely will be), then it's a good thing as there's someone checking and balancing yourself haha.

Think about the life time value of the furniture.

How long of a warranty does it have ?
Do you need to service it often?
Does it help in increasing the value of the house if you decide to sell.

But of course you would have to agree upon this with your wife :)