This is like saying Winner Take All Capitalism doesn't have an exclusionary mechanism for the rich. The system exists for the sole purpose of serving the already-rich. The vampires are an inevitability baked into the system from the start.
We don't technically have "winner take all" capitalism. At least some people 90 ish years ago we had many mechanisms to regulate such situations.
Then more vampires creeped in and convinced people that the government they were voted into sucks. So began a campaign to ruin the regulations protecting them from the vampires as they slowly filled their blood banks.