A fair point it just that in the initial buzz people on other forums referred to there being a 20% discount without adding the caveat that you had to have GSX.
Our launch promotion message, which was sent to all forum users (more than 8500), was very clear about being reserved to existing GSX customers, we can't be responsible if other forums reports missing informations about it.
And BTW, the whole point of making an offer for existing users, would require to have purchase "something". We chose GSX, because it's our best selling product, in order to allow the largest numer of users to get advantage of the offer.