trying to keep the cost down, have cut out as many of the 'extras' as we can. Flying Thomas Cook, we get 15kg baggage as standard, but they want another £180 in total for an additional 5kg each. I think that's extortionate - but - that's just a knee-jerk reaction.
Simple bait and switch on the discount airlines part. An airline will either get its money from the front of from the back end.
They charge you a high ticket price and you may shop around. So they charge less and then hit you with extra charges when its to late to switch airlines.