Reason stands to believe that the only people with legitimate complaints against one time use online passes or content codes would be those who make a habit of buying used games.
Frankly, I'm not sure why any consumer who habitually buys new games would even care unless they also sold most of their games and the lack of a code voucher reduced the "resale" value of their games.
While nobody should deny that the secondary market for games is a significant chunk of the overall industry, developers and publishers don't receive a dollar more whether an individual copy of their game is sold once, or a hundred times.
In short, they don't have any incentive to give anything to those who prefer to buy used. The incentives go to those who pre-order or buy new.
DLC is one way publishers have been able to generate extra revenue from used game sales, but this is hardly intended as a substitute for the sale of copies that actually count towards the total number of units a given game sells (which often determines budget for the next project).
Don't like it? Buy a new game on sale. They're often cheaper than used copies anyway if you catch the good deals.
