[ultrasaurus]

There are some steps slowly being taken to deal with that, in Washington DC, apparently the tax on vacant property is %5 rather than 0.85% [1] (although I expect that's more to keep their revenue the same since vacant lots aren't worth much).

The equivalent first step for domains though is for Google to stop treating made-for-adsense domains as real sites, so the $10/year/domain can't be offset by tricking advertisers and web neophytes.

[1] http://yglesias.thinkprogress.org/2008/08/more_vacants/

[ohashi]

That's not us in most cases. Our parked domains generally aren't listed in Google. MFA stuff is mostly SEO types doing that. We get our traffic from type ins (and old links) which is more profitable to send directly to ads without any BS content.