Ehh. "Shouldn't" implies a value judgment in there, and I don't agree with that. Disney already profits once at initial sale of the
DVC points, and current direct sales at anything other than CCV or Aulani are really 'direct resales,' and they're profiting a second time on those sales over their ROFR. Operating costs are covered by dues. When it comes to perks & benefits, Disney certainly doesn't offer them to initial buyers or 'direct resale' buyers charitably. If you buy an AP, or shop and dine at Disney, even if they give you a discount off those things you're still making them money. It's completely arbitrary to cut those perks off of secondary-market resale buyers but offer them to, say, someone buying 'direct' (but really still resale) OKW/SSR for $151/point.
They're a business that can choose to go for a cash grab if they so desire, but it's still a cash grab, not something that direct points buyers "should" have and peer-to-peer buyers "shouldn't."