well, there is also the fact that all the dynamic IP schemes
for DSL suck. most providers these days are offering PPPoE
which is a lot like a dialup connection in terms of the
ISP's level of control over the connection (it is a session
based connectivity protocol, i.e. your DSL has to "dial up"
with a username and password). DHCP is not so bad, unless
your DSL network is overbooked, in which case you can have
problems renewing leases (read: you can't access the
Internet because your ISP takes away your IP address and
won't return it or give you a new one). to me, avoiding all
of that hassle is worth a few extra bucks a month. my static
IP DSL is rock solid.
not to mention the fact that if you have dynamic ip service and are inactive for a given period of time, regardless of their "always on" advertisements, they will disconnect you to free up ips in the ip "pools". they simply don't have enough ips for everyone who is signing up, but if you get static ip service this never happens. i fully intend on getting static ip when it is available.
ps- there's more detailed info on this phenomena at www.dslreports.com