Why, hello there. I have a question for you.
It would not be a "product management blog" per se, but something product-y.
Because if The Grumpy Product Manager can't raise $10k to help her write a book, there's no market for independent PM voices. Simply put, you're all cheap and I'd be a fool to try and sell you anything.
Also, I'm unlikely to want to live in airports and try and train people to become something they'd likely end up not doing in 3-5 years anyways.
And blogging as a way-of-life, or even as a pastime, is vastly overrated. It takes time to write things. And writing things for free is a chump's game.
No, I will entertain you with tales of derring-do and whimsy. And try and convince you to have me come and talk to you and your cohorts (colleagues? cow-orkers? conspirators?) on topics of an urgent and compelling nature.
Some of which might have something to do with products.