I would certainly agree that showing both is preferable. However showing the upgradeable by default is hardly unethical and in no way evil.
When was the last time you walked through a model home with no upgrades or test drove a car without all of the bells and whistles? Even McDonalds greets you by asking if you want a value meal, not the .99 specials.
The point is that Delta wants to show you what you could have for a little (questionable I know!) more, not what you can get for the least money.