What capital is that shareholder taking elsewhere? Once a company has sold a share, it no longer has much direct interest in the value of that share on further

What capital is that shareholder taking elsewhere? Once a company has sold a share, it no longer has much direct interest in the value of that share on further transactions (much like a publisher only gets value from the first sale of a book, all other sales of that same book produce no value to the publisher). Sure, further share sales may become more difficult, but that is a distinct effect.