That's not very nice. Surely you wouldn't look a real person you barely know in the eyes and call them annoying and desperate for something that trivial.
Regardless, I was hesitant to add the nag, but I've only received positive feedback, e.g.:
Surely you'd expect a negative response if you walked up to random people on the street and said "let me follow you and show you ads!" IRL, I'd smile and nod politely, while trying to find a way to leave.
Considering we're talking about people choosing to visit my site, your analogy seems almost exactly backwards. They're walking up to me, not the other way around.
And, come on. The ad on my site takes up a miniscule fraction of the space above the fold and probably less than 1% of the total area of content on an average page on my site. Following people around showing them ads? That's a heck of an exaggeration.
Regardless, I was hesitant to add the nag, but I've only received positive feedback, e.g.:
https://twitter.com/TweetsOfSumit/status/534623233920598017
https://twitter.com/DanTheOther/status/550807053812252673
But, thanks for your opinion. It's interesting to hear what people think about it.