Monopoly rent extraction targeting a captive audience
Business customers don't pay for "having more buttons than mere consumers". Their business depending on such a crucial tool makes them reliant on swift and extensive support, negligible down times and so on. They are being cornered by ecosystem lock-in and workflow dependencies.
You could sell the same software at low prices to both "classes" of customers and charge extra for the services relevant for businesses. But then the fiction of "professional" whatever would be gone on the business side. And more importantly, companies like SketchUp would have to admit, they are merely SaaS with bad scaling prospects.
I think you mean ”companies like Trimble and Autodesk”.
”You could sell the same software at low prices to both "classes" of customers”
Slightly disagree. How do you brand the product then? ”Design your next hobby woodworking project” and ”Design next award winning apartment complex” are promises that speak to totally different markets.
So I would argue it would not make sense if you care about the brand.
Thats why these open source alternatives are so great - they are actually targeting a market no-one is interested to serve commercially and can have hobbyist specific brand without having to voice cringy boasts about being a perfect clone of something for the users of the said clone.
Expansion of software patterns to adjacent underserved markets via open source is really nice.