Because VC's are not gatekeepers? I'd love to get in on a round at the same time as a VC, but would definitely pass up on a startup which can't garner VC interest.
That's like saying "if an artist can't get a record label to sign them, I would also pass on them"... and now there are tons of ways to self-publish and crowdfund, including soundcloud and patreon and kickstarter!