HypersomniacLive: It's not about the deals that people may have missed due to the abrupt ending of the promo, it's about the principle of the matter. When it's sated that it's going to last until each and every single copy of the titles partaking in it have been sold, the promo should end just then. If any titles were not supposed to have a third run, then it should have been communicated in advance. If there were any time-limits, then that should have been made known in a timely manner.
The second newsletter GOG sent out about the promo made no mention of any special conditions applying to the third round or the overall duration of the promo, just the usual hype; that's double fail in my book.
I agree with every single letter.