That pisses me off as well. I've thought about just strapping a fatsuit shaped bag onto myself and fill it with any "excess luggage" that I'd otherwise have to pay for. I'm sure that would be uncomfortable as fuck, but maybe that would spark a debate. Why can't my luggage fly for free when fatties fat can fly free? (Granted, I think the "pay if you have too much luggage" is more to make sure that all passengers don't come with luggage weighing x10 what they do now but.. still).