Stop emailing me random requests to blog for your network. I respect what Technorati does. It's a decent blog aggregator. It does a good job at separating "real" human blogs from bot blogs and links to some interesting stuff. I understand you want your own content so you can make money off of that. That's all fine and good. If you sent me an email asking me to write about something I have a proven skill with and maybe a decent following to show for I would completely understand.
But by your standards my blog's "authority" is not so fantastic. You've also asked me to write about autos which was probably the best guess but still not something I've written about more than a dozen times. Then you decided to ask me to write about books, business, and amusingly enough travel. I have a constantly fluctuating authority level in those topics and pretty much never travel. This leads me to believe you are sending me spam emails.
Which is pretty crazy because otherwise I'd say the request is legitimately from you. Why would a high profile site need to send generically generated emails to random people in the blogging world? Upon visiting your about page I also discover that you all have emails either from gmail, cox, and scarily enough yahoo. Even gmail is pretty unprofessional coming from someone supposedly employed at a business. Also some of your twitter handles are neither your name nor say anything about who you are. That's pretty crazy. Someone too busy to go to the Web 2.0 seminar?
So feel free to invite me to blog for your site in the future. But please ask me to write about something I'm already doing a kickass job at. When I'm way down in your rankings and don't even have an authority level on a topic you ask me to "professionally" blog about it just makes me question you and your business model.