Unless the box states that it requires internet connectivity, in a clear and easy to understand way, how will the customers know? The majority of people interested in games don't read forums or articles. We are the minority in that regard. They see and cool looking game, and
assume it's finished because it's being sold at retail.
We can only see the front of the box, but it's almost misleading advertising.
"Early Access Version: Includes
free update to full game"
Game Company: Hey, buy our unfinished Early Access game and we'll give you the full version for free! Aren't we so nice, we're doing you a favor pal
Uniformed Customoer: Wow thanks man! What cool guys
Then when said customer gets home, and the game doesn't work or is in a broken state, what do they do then? How do returns work with retail Early Access games? It sounds like a nightmare. To me, this seems like they are seeing are far over they can screw consumers.
When you back a game on Kickstarter, there are no legal obligations for the developers to deliver on what they have promised. When you sell a game on Steam or at retail, you are under legal obligation, in most countries, to provide the features you have outlined in your product description, otherwise it is false advertising and you can get hammered for it. That's my understanding of it anyway.
In fact its kind of cool since some people might not have a great internet connections to download the full game.
This is exactly the problem. Does the box state how big the updates will be? Early Access games usually get updated a lot. Even if the buyer doesn't have good internet and thinks it's a good idea, when the updates hit, he's going to be out of luck.
Not to mention that after a couple of updates, the stores will be selling outdated copies of the game. Seeing how massively some Early Access games change during development, it could even lead to a game being falsely advertised. For example, say a game promised co-op support, then during development, cuts had to be made. The box states there will be co-op support, but the game will never have it. What happens now?
Early Access games already have too many 'what if's'. Selling them at retail is insane.