Paying For Actual Speed

Every ISP wants users to pay for actual usage. Fair enough, but how many mention paying for actual speed you are getting? It's ridiculous that I should pay the same for a DSL connection whether I'm 1 km or 3 km from the Central Office. The difference in maximum possible speed is significant between those distances. The ISPs never mention this difference at all, except as a vague "up to" references in the advertising.