IMO expecting a discount is unreasonable, it at least borders on entitlement thinking. There is no obligation to offer any discount (or other perk) and it should not be expected. The economics will drive the issue as well as DVC's interest and tenacity. I do however feel that DVC should actively seek good discounts/perks but until they are willing to play hardball to get them and the membership willing to give up certain options in favor of better pricing, this will not happen. DVC is in a no win situation because they can't realistically go outside the Disney family such as to Universal to create competition and the other separate business entities know this. That members spend money while in residence has no meaning because anyone who stays (and someone will) will be spending money and for non members, likely more than members on average.
Unless I missed it thankfully no one has gone the "be fair and treat everyone equally" route which ignores the reality of life. I've seen people threaten to boycott businesses that didn't treat everyone the same which essentially means they can't do business with anyone every. The reality is that for companies like Disney, discount are economically driven, not a reward or gift, 100% of the time.