I don't follow the chemist example. The patent is still valuable to companies who do want to productize it, or even companies that don't. Companies can still buy and hold patents without doing anything with them, it's just that they are barred from litigating them. They can still resell the patent to someone else, potentially for a profit.
A "practicing" entity has either brought a product to market, or uses the invention themselves in the process of building a product on the market. Someone who is planning on building a product but has no funds doesn't get to litigate unless they are the original inventor. Your last example seems to imply that they are the original inventor.