I thought the primary difference between intellectual copyright and other inheritables is that copyright only exists to further the public good and motivate the creation of new works?
You can't own an idea -- but we'll give you distribution monopolies
for a limited time if it will encourage you to think of new ones.
Are you more likely to write a book in the knowledge that your heirs will benefit 70 years after your death, than you would be if you yourself got 28 years of royalty payments? Excuse me while I laugh...
Why does copyright EVER end, if you keep trying to compare it to houses and shares in a company?