Because they want your money, short answer.
I scored a 600watt Osterizer blender from Costco at a good price some years ago, well under $100. Not many settings, but powerful enough. I stopped using it, actually, in favor of another Osterizer blender, 450watt, IIRC, but powerful enough for my smoothies, etc. It has a lot more buttons and switches. I stick with Osterizers because I've burned out a number of other manufacturer's blenders, don't remember burning out an Osterizer. Also, I have a terrific attachment that works with Osterizers that grinds meat.
I have a machine that will make carrot juice but leave it in a cabinet, some former roommate left it here. Another former roommate left an electric citrus juicer, which I use to extract the juice from lemons occasionally. It works fantastic. I see fancy expensive blender systems at Costco but never give them a look. Why spend $300 for something when I'm satisfied with what I have?