What do you mean by valuable invest cost? Elaborate please.
example, You bought a bitcoin for$ 250 . How much You want to sell it
As much as possible of course. Stupid question.
Lol.
My own personal answer would be, 1 Bitcoin = 1 million USD.
If there are any takers, just let me know.
I'd suggest taking me up on that offer now, because if hyperinflation hits, 1 million USD will be a bargain.