You go to a VC because you are poor working-class but have an idea. If the VC funds you, it has concluded that your working-power can help it achieve its capital interest goals plus some positive PR.
Some VCs are likely to be good at strategic judgements and stick along. Others may change their minds. It is not so much about your ability to work for them but their ability to meet their capital interest desires sticking with you.
It is their business your business fuels to their satisfaction — or not. As you have said: They meet 20 CEOs and probably get 20 new ideas of willing, working-class poor onto their tables every day. Among the masses of poor members of the working-class with ideas, they got much more freedom of choice than the poor, working-class founder.
When you get dropped and hurt, what you feel is not the loss of friendship. It is that in such a moment the illusion of friendship which you have created bursts amid reality and you feel helpless and powerless. That is what you feel!
Because nothing can bridge the gap between oversupply of poor working-class people and short supply of capital — not even thousands of VCs who turn working-class poor into Silicon Valley millionaires.