Because there is a salary cap. You can't bring real world circumstances into it and say "If I want to work for another company for less money because of various reasons", that's fine. But your profession isn't governed by a cap to try and level the playing field. By saying there should be no notional value you open up a lot of gray area and how can we be sure they wouldn't be getting payments on the side or other incentives. In this case the whole 'needs to be closer to family' thing applies even less in this case due to the amount of clubs he could have played at and still been in Sydney.