Rob,
I think they are limiting speed for more money. http://www22.verizon.com/content/consumerfios/packages+and+prices/packages+and+prices.htm

They are offerring up to 30mbs on residential accounts but I did see somewhere that 50 was available, maybe on the commercial accounts.

I had cable which had the potential for higher speeds, but routinely slowed down pretty slow during peak hours. Cable also had some higher perfomance packages for more money.