Well I doubt that zombies would readily suck up that much time, but VCs would rather all their portfolio companies take bigger risks if it increased the chances

Well I doubt that zombies would readily suck up that much time, but VCs would rather all their portfolio companies take bigger risks if it increased the chances of a runaway success. Much better for a VC if twice as many of their companies fail, but they get just one more unicorn. All the returns come from unicorn companies, it follows a power law distribution.