In a word yes.
The traveling public don't like paying the ever increasing 'hold baggage charge' levied by carriers such as Aer Lingus & RyanAir - and so often attempt to bring lots of baggage onboard. This is facilitated by the use of electronic check-in kiosks and on-line check-in - so the pax carrying 2 large bags only comes to the carriers notice at the boarding gate.
This in turn results in a delay while the case(s) are tagged and hold-loaded.
In fairness - with the hold baggage charge up to €18 per bag now on Aer Lingus I cant' blame anybody for trying to avoid it. It's a complete rip off......