`Your' Internet not working is completely orthogonal to my use of DHCP.
What happens to the previous address? Does it get returned to the cusotmer after his/hers DNS stops working? He does not know that the "Static" address that the provider is advertising is as static as the piece of hardware that connects him/her to the provider. Remember, the vast majority of people, including those who happen work in some levels of this industry, dont know what a MAC address is etc. At what point the automated system will smell something as fishy? Would that happen if it sees ten different MAC addresses within a day? Two days? Three days? There is a higher cost to provide the static address service. Giving it for free makes no sense. There is a much smaller cost to provide dynamic address service, which tends to be built into the provice of the product. Alex