Hope I am not crossing boundaries here. 2 things which always come up. If you are using software for commercial purposes then morally if not always legally, you should pay for the use of the tools. It is prudent business you don’t want to get busted legally, maybe pay a chunky fine or a lot worse. If you are making money using software you can afford to pay for the use of the tools and should. If you cannot afford to pay for it but want to make money of it, that is poor business end of story. I agree that some companies seem to charge for some products a lot more than perhaps the value seems to be worth, but they made it. They got to eat as well.
There is one possible alternative for you I know of, and that is to learn Blender which is free and free to use commercially. Blender is unbelievably cool and there is an enormous range of free and paid for Add Ons for every possible use including getting things properly dimensioned and so forth. That is a way out however, if you want to use SketchUp for commerce, then suck it up and go and pay for it. Good luck.,