This is the second time I hit the following (or similar) message, but I don't really understand what I did wrong.
STOP! Look and Listen.
This was an audit, designed to see if you were paying attention. You didn't pass. Your review was inappropriate. This was a high quality post and you should have considered leaving it as-is or even upvoting.
Don't worry, we've already handled this post appropriately – but please take a minute to look it over closely, keeping in mind the guidance above.
A first time it was a very long post which to me looked as a hidden\indirect advertisement of some book which I considered missing the purpose of this website, so I decided to downvote it. Well it was an audit which I've failed and I discovered that this post had many upvotes. Ok I learn from this that advertisement is ok here and since I don't agree with it I will just skip such reviews in future. I didn't hit the I understand button, because I didn't agree.
The second time, just recently, I found a normal post and decided to leave some comment. Why did I fail the audit this time is totally unclear to me. So I'm not going to hit the I understand button again.
I saw some posts here as well as the FAQ of reviews. I found posts with similar problems. I found that this "should not discourage me from reviewing", but I do very frustrated.
My question is what is an incentive for me from reviewing posts? More precisely why should I continue review?