It's probalby half off because Reebok is going back to the Reebok and away from the RBK. The Crosby 7k is a standard 7k stick with a Crosby curve and a gold paint job. It's a nice stick, pretty much all of the pros who use RBK sticks use the 7k. 9k is pretty much all style and marketing.
found it to be very unbalanced and did not like the performance of it at all. maybe it was just the stick i tested out but it was brutal. but since you're getting it for so cheap, give it a shot. but my opinion, STAY FAR AWAY FROM IT!
Even for $75 it's not a good stick. It's heavier than what you pay for, and it feels unbalanced especially with slap shots. I never really could get one to fly off this stick for me. Never quite figured out why. Just my 2 cents.
I actually got to toy around with one of the pro ones once, and it was sweet. I know a guy who's a pro equipment manager, he runs a little shop /service center out of his garage during the summer. He had a couple up for sale, but they were 100 flex, and were all heel curves and only one right- None of them would work for me. But I tried one out and the balance was sweet and the stick was light.
So I liked it from that little bit. Can't speak to feel or durability though.