I don't know. I think everyone has to figure out how to make a buck in this world, and inventors that don't produce any products anyone wants should be (in a fair world) out of luck.

Ethically, I think you have to do more than just file paperwork and leverage the government to extract money from others. It might be legal to tax people producing products, but it isn't moral or ethical.

Besides, it isn't the inventors (generally) who troll. The patents are sold to lawyers (like Intellectual Ventures) that troll, and they are the inventors on very few of the patents they take to court.

Maybe actual inventors can sue even if they don't have a product? I see no advantage in this, but I doubt this group is big enough to matter either.