Whilst your point about delays is undoubtedly true - as experienced yesterday when - partly due to the breakdown of Pulsar 2930 at the roundabout in Llanfairfechan (details from Bus Times
here), two following journeys were delayed by roughly
70 and
30 minutes respectively (links to schedules from Bus Times embedded in the 'delay' numbers) - leading to a massive gap in Bangor bound services out of Llandudno and Conwy around the evening peak.
You have to take into consideration the fact that there are significant numbers of 'through' passengers across Bangor, who would be much inconvenienced by such a change. And what about through fares? It's a delicate balancing act.