As you said, there is not much in the way of direct financial compensation for having a PhD in industry, but it can act as a foot in the door and it can (depending on the company) mean you get treated a bit differently once you are hired. Researchy type projects tend to get pushed to people who are good at open ended researchy things, and having a PhD is a good indicator of that.

For me the biggest value from my PhD came from the writing up. It is really, really, really hard to get from having "done all of the work" to writing a coherent, well defended thesis on it. You will get very good at spotting holes in arguments (particularly yours, but also other peoples). You will get a very real understanding of how much work is involved in getting from 95% to 100% finished. It's not directly valued in industry but I know that I benefit personally from my writing up experience.

And you get to call yourself doctor. That's nice.