Note, it's unblock-us.com -- and it's a vpn service, not a registration provider if I'm mistaken. Just because an entity exists selling something at $x doesn't necessarily mean it's financially viable. Companies go out of business all the time because they don't charge enough. My company used to sell services at $6 a month and we had 2x the client-base that we have now at 1/10th of the revenue.

If dropbox worked on a usage-based billing model they'd never net nearly as much income as they do offering ~100 gigs to users who would barely use ~10 gigabytes of space a piece on average.