I now understand your point, and I thank you for that. It was escaping me, because I so strongly hold the opposing point of view. Thank you for explaining it.
My view is that with an ESPP policy, Netflix helps align employee incentives with investor (and executive) incentives, and that makes those employees more likely to act as shareholders and take a pro-company mindset. It serves a legitimate purpose and is a hell of a perk, IMO.
Taking that perk away hurts the poor employees more than the rich employees. Rich employees can invest in other stocks, bonds, real estate, etc. Granted, the ESPP is an excellent investment vehicle for them so it's not a surprise they take advantage of it, but if you kill the program, you hurt the very people you're trying to help.