Horses for courses, I tend not to surf the internet on it when it's asleep.

That is to say that I don't really care for "notifications" from ebay, email or whatever, I get those on my phone and that's always on my person - which the N7 isn't.

I'd rather know that when I went to it there was a good chance of there being enough battery life to do stuff - rather that having to actively remember to recharge the thing OCD stylee.

I agree though, it'd be better if it was negligible and it could be kept on, but it isn't and it turning wifi off while it's asleep has zero impact on its usage for me, YMMV.