exactly - I would call this the "forgetting the entertainment value" fallacy :)

Also you can't turn your time into money as fungible as spending money is. So Tme is more "liquid" than cash.

That said I got a 3d printer in mid-2016 and basically printed daily getting to know it until the start of 2019 - I had sooo much fan turning the wooden printer i started out with into something reliable. Nowadays i mainly print stuff as I design and need it a couple times a month.

Time is not money. When you spend money - you lose money. When you don't spend time - you lose time!

If you sell your time for a living, then time (during certain parts of the day), does have a value. If you aren't selling your time and are doing something else, you are losing money.

For the vast majority of people who sell their time for a living, their time doesn't actually have value because they are either on salary, and cannot exchange more time for more money, or their manager controls their schedule and they do not get to choose how much time they get to sell for how much money.

With inflation when you don't spend money you lose money too.

Eh, at some point you end up with a backlog of things to do where you never have unspent time.

I've got about 3-500 hours left on a home renovation project, 10-20 on a playhouse for my daughter, 50 or so on a desk for myself, 1000 on a personal programming project, I really need to spend about 500 hours getting back into shape, and all of that is competing for the time I have left after the weekly commitments I have to my day job, my family, and basic self-care.

Practically speaking I'm working with about 10-20 hours a week here of discretionary spending, maybe 30 or so if I'm really tight and can use all the disjoint minutes effectively, and will get through my current backlog in 2-3 years. If nothing else comes up that's higher priority.