Finance pays a fair market wage, which seems high by comparison to all the unfair players out there, but isn't actually that unreasonable.
Startups pay a theoretically fair wage (if you accept valuations at face-value and exclude liquidation preferences). It's when you see the equity/cap table (2% for useless VPs and 0.03% for engineers)-- as well as what the founders have done to ensure their careers no matter what happens to the business-- that you pick out the classism of the well-connected. If you look at salaries alone, though, you won't see it.
Outsiders complain about finance "bonuses" (finance salaries are only at-market) while failing to account for the fact that that's a much fairer compensation system than whatever they get at their corporate jobs. Granted, the banking bonus system is horribly corrupt in practice; but in theory there is nothing wrong with it, and I'd rather have a corrupt profit-sharing system like that in finance than none at all.