It depends on the keyboard..
Compared to some grand piano's guitars are really cheep..
Some vintage synths also go for over €10k like the jupiter 80 or the SC80
And then there is churchorgans really priceless..
Makes me wonder why someone would ever spend that much money, if a workstation can get them all in one and some of the best guitarsounds on top of that... Nothing beats a keyboard...
Unless you are at the beach staring at a campfire withs some beatifull girls around you and a half empty bottle of Jack D. Thats where a simple guitar outshines any keyboard.