Items important to one may have personal value, however, if it has zero value to 7+ Billion people is worthless.
I recall a friend came up to me with a painting painted by a women who was a counter server in a Lebanese restaurant that served less than $10 meals.
She told him it was worth $5,000 and was a gift. I told my friend it was worth zero if there is nobody willing to pay for it.
But I do agree with you, bitcoin and many items such as my friend's painting have no intrinsic value.