Well that's not strictly true. It has never been at "full price". Early Access offered a discount of whatever it was (20%?).
It's not a surprise that it has been heavily discounted now. They're probably close to serious-sim-racer saturation if not already there.
I have no complaints about the sales, EXCEPT: If it never ever ever is on sale at its claimed "full price" the price our early access "discount" was calculated against, then I will complain a bit. I expect it to go up for a week after the 1.0 release, and then straight back wayyyy down.