I think that many people are taking issue with the way you phrased your intro. Something like, "Hey, I'm launching a new startup, to prove to myself that I can do it again. Why don't you follow along because I'll be sharing each step of this journey on my blog!" may have been received better by the community. Nevertheless, the approach you took is a legitimate one. And of course, you'd be a fool not to take advantage of your notoriety as a means of propelling your new startup. You worked hard to get where you are, and fully deserve to take advantage of your position, connections, etc.
You can become Wordpress's Heroku if you play your cards right, and I don't see how you are not going to make big money out of this company as well. My only suggestion would be to reconsider your pricing, so as to make it more accessible (while also meeting the needs of those who don't quite require unlimited blogs). For example, you could charge $29 for a single blog, $49 for 3 blogs, $99 for "unlimited".