Honestly, I think spending this much money is a little strange. I have a $20 adjustable piano keyboard stand that does fine. It takes all of 30 seconds to adjust the height by loosening a knob and moving the leg props to a different notch.
Based on your description, it sounds like you probably live in your laptop. Other folks don't, and a hand-adjustable keyboard stand may not work very well for them. Imagine, for example, trying to raise something like that — even assuming it could take the weight — while using multiple monitors.
One would hope... 88-key keyboards are 45lbs (about twice a normal 27" monitor) and the older ones are significantly heavier... a non-POS stand should take >120lbs without a hitch.
That being said, there's certainly nothing wrong with a product better tailored for its purpose.