The LCCs have to manage costs to deliver the now universal cheap flight to the public.
Having cut sales and distribution costs by going over to web based sales and now check in, and minimised ground handling costs by using secondary airports who will often subsidise the operation they have to look at other ways of bringing down their expenses.
Fuel is the obvious big one but there still exists in the mind of many the " add half a tonne for the wife and kids" mentality: that doesn't help anyone. Fuel accounts for between 16% and 20% of the airline cost, flight crew around 14% and ground handling and airport fees around 14%.
Better, in my opinion, to make the savings on fuel and airport / handling charges than on flight crew: however, when MOL tries to push the airports into cutting their charges he is vilified on here.
Surely a 2% cut in airport fees and all of us working to minimise fuel burn is a much better solution than cadets at easyjet working for virtually nothing.