It's very hard for individual inventors to get paid. For the same reason that private equity is valuable - broadly, that's a good thing - in the case of patents, many that own them aren't in a good position to take the next step.
Microsoft, Apple, Facebook all bought huge patent portfolios to further their strategic game. They're doing what I'm doing!
Making money from enforcing patents is no more wrong than investing in preferred stock.
In the early days of the software industry, people cared about copyright and didn't give a damn about patents - they copied each other willy-nilly.
I've never filed a patent lawsuit. I hope never to file a patent lawsuit. That may be unrealistic, but it would be great if I could avoid doing it... Lawsuits are a ridiculous way to do business.