Allot of people will just learn to root their phone for free wifi teathering, or they will just add tethering to their phone plan and use that. Paying for a service to give a gameing council that can double as a web brouser such a small limit is laughable.
I am also guessing all of the poor sales that I read about is due to lack of WiFi version because if i went in and they told me all they had was WiFi left I'd walk away. Even if it was only $50 more thats enough money for a game.