Where would you draw a line for "any real product" ? ARM for example doesn't actually produce any "real" (physical) product, but they certainly do research and produce technology for other companies to build products on.

There's a lot of "on paper" companies around the world who actually do produce novel technologies even if they don't themselves create the end product, but instead sell their inventions to other parties.

This problem is already solved by a Patent License Agreement. I don't know why people think this is a difficult problem. It's not.

It actually is a difficult problem. Not only could the patent holder want to charge too much for the license, they may not want to grant a license at all. The problem is that patent holders have a monopoly when they should not. Licensing should be compulsory, at reasonable rates.

So, no researcher can own a company.

Why did everybody just accept the idea that what makes a troll is them having no product when the problem is clear the high costs of litigation and low quality of the patents (and the patents selection)?

IBM is the largest and most destructive patent troll around. And all of that is just propaganda designed to make it and other companies like it rich.

The problem with patents boils down to abuse of monopoly power. The solution is to take the monopoly away.

I don't think they should be illegal... companies that don't "produce" anything are useful for lots of different legitimate reasons. But the bar for suing for damages should be a lot higher than just, "we happen to own the patents."