Thurston staying at the Cowboys?

I think the Cowboys have paid over the odds for Thurston and it looks like that old chestnut "I will go to Rugby if I don't get more money" has worked again. Sure he's a good player but he hasn't delivered them a premiership so far, he's getting more and more injury prone as he gets older and he defends like a turnstile because of his dodgy shoulders. Why is this such good news for Rugby League?