We'd all move for more money - but - and THIS IS THE CRUX OF THE MATTER - he wasn't being exploited on slave wages. He took advantage.
If you were offered an amazing deal compared to a minimum wage scenario you too would tell your boss to shove his job. On the other hand when you're on a big screw a certain amount of loyalty and integrity is expected - especially when your employer has paid money to release you from your last job.
But then we're dealing with a moron whose Mr 15% smelt an opportunity.
A little possible scenario for you Dan:
Gosling "Hi Boss, will you be giving me a new contract?"
Moyes "We'll sort something out soon Danny".
Gosling "But my other contract finishes soon boss".
Moyes "Don't worry son, let's get it done next week".
Danny gets injured .........
Gosling "Can we sort my contract now boss?"
Moyes "Look Danny, stop bugging me. Soon I said".
Gosling "But boss".
Moyes "Let's see how this injury mends. Don't worry though. Real soon son".
Newcastle "Hi Danny. Want a 4 year contract? We'll risk your injury and sign you anyway. You'll get a game".
Gosling "Boss? About my contract"
Moyes "Not now Danny. I'm busy with pre-season".
"Gosling " Hello. Is that Newcastle?"....................................
Not hard to imagine Dan surely mate.