Again though, the person buying the share and the person selling the share, and even a third party (who offers loans) all come to an agreement that the best opt

Again though, the person buying the share and the person selling the share, and even a third party (who offers loans) all come to an agreement that the best option at the moment is to sell the share. Loans are available to the would-be seller, if the sale of the share would actually screw them. Loans and fundraising rounds are therefore in competition -- and it's not like a company hasn't been built on loans before (Cisco was built off of credit card debt in the beginning). The seller makes a judgment about near-term vs long-term pros and cons, deciding where to allocate most of the value.