I just did a Pay Per Post ad and was glancing through the remaining opportunities when I came across one that offered a hefty payout, but included this restriction: "We would PREFER you NOT to disclose that this is a paid post."
What does that do to the integrity of a blog? If I'm blogging about some product or another and I don't tell you I'm being paid to do it, doesn't that corrupt the rest of my writing from there on out? And how obvious would that be, anyway? "No, really, guys, I'm totally in love with my new SewerVac. I've never had such a clean sewer line. It hardly ever gets clogged up and fills the lower two floors of my house with raw sewage now that I'm using SewerVac!"
Uh, I don't think so.
So just what is the Pay Per Post client who doesn't want you to be honest with your readers selling? Their product or your soul?