[wampus]

That's true if you're trying to save money by putting a ton of domains behind a single wildcard cert using a single private key. But there are security advantages to using multiple wildcard certs based on different private keys. One of them is that you can develop a nearly infinite number of sites without exposing the domain name via the certificate, so they can't be crawled or pentested until they are deployed publicly. The number of certs you buy should be based on the number of private keys you can securely deploy.