You know, this happens every year. Ableton has a sale, somebody pipes up and says "Hey, WTF?? I just bought last week at full price..." and then the replies start flowing:
Ask them if they'll refund something
It was worth full price when you bought it
Maybe they can warn people about sales
But then they'd have to give retroactive discounts to everyone
STFU n00b
etc, etc...
I guess what I'm saying is: Search the Forum before complaining about missing a sale.
(BTW, this happened to me too, when I first bought Live 6. You'll learn when to to pay to get a deal as time goes on, don't sweat it...)