Could it be because this country is going down the pan?
My 25 year old daughter and her boyfriend have just spent a year in Perth, Australia on a year long work visa.
The city is young, clean, modern, has great public transport (free in the city centre), is right on the beach, and they both love it.
But they have to come back to the UK soon when their visa runs out and have to come back to this country where houses are overpriced, rents are high, benefit fraud and crime is rampant, city centre bus transport is dirty and unpleasant, and the weather is crap.
If they can go back at a later date they will, even though it will upset my wife.
If I was 30 years younger I would join them as I have had enough of this country.