I can see the "He's earning a shed load more money" argument, but I've never understood it tbf.
I see it like this, even as a L2/L1 player, your salary is still double that of the national average. If your clever and don't live a massively lavish lifestyle (not to say you can't enjoy yourself) within a 10/12 year career you should really be able to set yourself up for when you retire. Marcus Tudgauy for example invested in property. If you can acquire 4 or 5 3 bed semis in your time and have them rented out at £650-700 a piece, you'd still be bringing in roughly £3.5k a month. Still higher than the average salary.
And besides, who at 6 years old dreamt of being a professional footballer and playing for their team? And who had that dream because they "wanted to make as much money as possible"? Anyone? No, thought not. It was because you wanted to play football. Not sit on the bench earning a packet load! Footballers today are selling out their boyhood dream for greed.