Cashes out how? That is what my confusion is. Shares don't have inherent value so to cash out you need to sell it to someone (sometimes the buyer is the company itself but I don't think that is sustainable beyond few percentage of their shares). Its not like an asset backed currency where you can go to a central bank and ask for consumable resources. (Although most times the asset is also useless, like gold). Its all just floating in the air from my point of view and "value" is just what someone else is willing to pay.