Those guys are doing it wrong. First, automatically assigning 2 IP addresses per VPS, no questions asked, is extremely wasteful, is part of the problem, and is actually in violation of ARIN rules which state that there must be valid justification for every IP address issued. At least they're going down to just one address by default. Linode, in stark contrast, only issues one IPv4 address by default and really puts you through the ringer if you want more. AFAIK they'll only give you extras if you're running HTTPS vhosts with distinct certificates (and they check too!).
Second, while I commend them on offering IPv6, they only give you 3 addresses??? IPv6 has been designed to support large allocations of addresses to end-users. Comcast currently routes a