Liability may be the wrong term for it, but if you want to do several expensive things, you probably want to make sure you've got enough money for all of them and prioritise if you don't.

Maybe you never want to work again, and you want to buy a yacht. It'd be poor planning to end up back in work at age 60 because you got a bigger yacht than you could afford at age 45.

That doesn't mean you can't buy a yacht, it just means you might want a 60ft yacht instead of a 100ft yacht.

Liability is exactly the right term for it if it costs money.

No. Liability is money you have an obligation to transfer.

Dreams that involve money are not liabilities, at all.