Here's a scenario:
Easyjet decides to open a base in say Budapest. With the local contracts now a fact, the company will pay, and I qoute "market rates and not a penny more.
Let's say 80000 euros would be a rather good pay for a local capt. Now the company introduces 3 point flights. (as heard from the mouth of the people director)
For example BUD-LGW-AMS-LGW-BUD
All of a sudden they need less crews in LGW and more in BUD. Now the time for new pay talks arrives.
What do you think the company is going to say?
"Dear UK pilots. Your Hungarian colleagues are about 15000 pounds p/year cheaper. You can either accept a pay freeze or we will expand the 3 point flights, accept the odd night stop and reduce the UK bases.
Do you think the hunagrian colleagues will go on strike for your pay? off course not.
Your uk based ivory tower is going to come crashing down before you know it.
Divide and conquer.
Let's try and work together to avoid this and keep everyone on 1 overall package, tweaked here and there for local taxes/regulations.