I don't get that. If you are going to go out and suck off someones draft besides being a leach what do you get out of it? How much practice do you need suck off someones wheel? All those folks need their mileage discounted and they certainly aren't doing themselves any favor in the exercise department. Probably the same folks with stripped down road bikes who can't be bothered to carry a pump, co2, tube or even a patch kit.
Hm... I think I see why I ride alone much of the time