Easyjet, and the other low cost airlines are permitted( and actively encourage)
selling up to 60% of seats with the priority boarding surcharge..
We ,when necessary, use scheduled airlines(usually thro Germany).they very often have excellent offers. no hassle,generous luggage included, punctual and courteous. And sometimes less costly!
Of course for a short (timewise), or urgent trip, with little or no baggage, the cheapos are ok, but not for me if i can afford the alternative!