Dynamic IPs

Just a thought - Dynamic IPs on their own might not permanently identify you, but your ISP also has access to the MAC address of your modem/router.

Don't forget, this is not some disassociated company out on the 'net doing the data collecting - this is your directly connected ISP, which makes it so much worse because as well as your technical connection data - they also have your personal subscription data (name, address, age, phone number, credit card number).

If they log the right set of connection data, they can very easily re-associate you and your browsing history with each subsequent IP address ... granted its a lot of data, but they're dealing with a lot of money from the advertising revenue.