There are plenty of potential customers that are NOT on Twitter and would have no idea. Still, it's probably not the best idea to say "hey, don't buy it now!"
A lot of that has to do with combating the leaks and getting in front of it with correct information. And most shoppers don't see the...
For sake of information, "steam winter sale" was never mention in the tweet.
https://twitter.com/#!/geoffkeene/status/142402108497461249
Admittedly, given the date range, that's probably more than just a normal sale.
Just to add some data. Gamestop in San Luis Obispo had it for the sale pricing. Amusingly, said store had not received the new ad, so I think maybe corp dropped the ball on some level.