But if the plane is busy and they can charge it, it would be a poor business decision not to.

Flights on EK to and from ABZ are always more expensive as they don't seem to have a formal regional connections partner. They will route you through MAN on either Flybe or BMI, BMI or BA to LHR, Flybe to Gatwick or even Eastern to Newcastle. Etihad and Qatar have however seem to have clearer agreements / code shares with BMI and this will help ticket prices be lower i suspect.