As always people forget a step. What you have is...
"Customer purchased product from store.
Customer owns product from store.
Customer after some period of time sells product used to somebody else.
Store already got paid, so they have no legal interest, much less moral or ethical interest, in the second sale.
First Sale Doctrine covers this. Everywhere else in the physical world you cannot pull this fucking shit for two seconds without being called crazy greedy retarded sons of bitches."
But before the customer purchases the product from the store it is well within the manufacturer's right to sell the product how they want it and how much they want it for. As long as they are not being misleading and are upfront with what is happening they are in the right and it falls under buyer beware. Now whether it deals with a service like online play (which is not subject to first sale doctrine) or DLC (which is NOT found on disc) then you as a consumer are not entitled to that material. Your personal opinions about the "value" of the game doesn't allow you step over the companies rights to distribute the product how they see fit.
The real question that keeps popping up in my head when people complain about this is.... are people practically PLANNING on selling this game after buying it brand new? If you do not think a game is worth it, why buy brand new? If you don't plan on keeping the game (a choice made before purchase) then why not just "rent" the game? I really don't get the overwhelming sense of entitlement this generation of gamers seem to have regarding DLC and services and expect these companies to feel pity when you loudly proclaim your desire to fuel the second hand market.
I think these devs and companies are making a stand. If you think these games are worth it, support them outright. If not, feel free to hold on to your personal feelings of entitlement and let them burn. Either way, the message will be felt if these devs close up shop. It would entice the pubs to only shift big bucks into guaranteed successes and the more unique titles drop tremendously in budget and quality or simply fall by the wayside.