Yes, if you just need a single fader for Nuendo, for $199 you can get the X-Touch One or the Fader Port. Even build quality probably wouldn’t make up for the difference.
But if you are using the rest of their controllers or using some of their plugins, then it makes sense and is inline with the overall system.
Their plugins are quite good and affordable as a subscription. My only issue is that they’re all stereo only. So great for some projects, not as applicable in film post or immersive/surround mixes.