Yes there were a couple of players who left Sydney to go back home.....same thing has happened to Brisbane, Adelaide, WC and even Melbourne clubs.I suggest you look into the history. Short answer, players drafted by Sydney and Brisbane, two years later back in Melbourne.
I suggest you actually check into the cost of living in Sydney. Here's the best answer:
http://www.numbeo.com/cost-of-livin...untry2=Australia&city1=Melbourne&city2=Sydney
"Consumer Prices Including Rent in Sydney are 13.89% higher than in Melbourne." Therefore players signed to Sydney are worse off with the COLA than players in Melbourne.
The funny thing is that there are players who actually prefer living in Sydney, as they can relax and not have to deal with the fishbowl environment of Melb, Perth and Adel.
http://www.numbeo.com/cost-of-livin...country2=Australia&city1=Adelaide&city2=Perth
Consumer Prices Including Rent in Perth are 26.03% higher than in Adelaide
If it was truly about equality, surely the Adelaide clubs should have a salary cap 26% lower than those clubs based in Perth.
The history is that the AFL previously believed they had to help prop up the expansion clubs.....fair enough when they are new.
But Sydney is no longer an expansion club, it is a club that is well established and should be able to stand on its own now. It doesn't have a problem attracting players, Sydney is actually a desirable place to live....much more so than Brisbane.
You either have Melbourne as a baseline and adjust ALL clubs based on cost of living...ie Sydney and Perth caps inflated, Adelaide, Geelong sliced.......or you don't change it for any club.
If it is about retention, how do you then explain Sydney getting it but Brisbane not getting it??