if you can, you will get the lowest fares
If you can't you won't - i.e if you need loads of bags, if you need to constantly change information on your ticket, if you can't check in online, if you are hungry when you get on the plane.
Come on SHEEP people - if you want the lowest fare, stop being so inconvenient on the airline by absorbing employee time...
thats how we can offer genuinely lower fares
D'oh!