double agreed. however, it does bug me charging on weight for baggage when fat people pay the same price as extremely lightweight people. Someone who's 105 pounds with a 52 pound bag gets charged extra, while someone who's 290 pounds but has a 49 pound bag pays no extra charge. Dunno quite how they'd ever get around it, but it does bug me. And I say this as someone who's got a few extra pounds of his own :)
"Proper" airlines generally aren't very picky about the weight of your luggage, so it probably wouldn't apply to them, only to airlines like Ryanair that are.
I don't think it's a good solution, but I can relate to to bitterness of being charged for a 2 kg overweight and then getting stuck in half a seat because the person next to you is the size of a cow.