That's probably your queue to run away screaming. Guest blogging for the sake of guest blogging is a very bad idea these days. You might also want to mention that 'Loved by Moz' bit to someone at Moz. They can confirm or deny. Whoops, they just did.
http://www.mattcutts.com/blog/guest-blogging/
That's not to say all guest blogging is dead per se, but guest blogging for ABC plumbing company on alllandscapersseolinks4all.com is dead.
Here's a semi-fictional scenario:
Internet Guy A walks up to Internet Guy B and says; "Hey, for some reason I don't want to post this on my own deal, but I think your audience would really benefit from my words. What do you say?"
And Internet Guy B says; "Cool bro, much trust. I know you'll behave yourself and be excellent - Wyld Stallyns 4 eva!"
Then Internet Guy B would be vouching for Internet Guy A. Everybody's p-toot is on the line and the honor system, with editorial control on Internet Guy B's part. So long as Internet Guy A or Internet Guy B aren't offering a material incentive for the post and everyone follows the bajillion other rules, some unwritten, everybody is cool.
But what you're talking about seems to be scary and you may want to think twice. Do you really know who you're getting into 'link bed' with? You don't until it happens. In the real world, that takes an inordinate amount of vodka. If you've had one of those nights, you know it isn't pretty.

