http://xenforo.com/community/threads/beta-release-date-and-pricing.3876/Early Adopter Special Offer
The beta period will begin with a special offer period, during which licenses will be sold for $100 USD. After 24 hours, licenses will return to the normal price of $140.
I suggest that during the 24 hours of the GOLD release, the licence price was dropped to $ 100 (instead of 140 $)
Personally, if this suggestion is accepted, I would buy a new license