Also note "of demanding money from someone in return for not revealing compromising information which one has about them." If money isn't involved it can be argued that its not "real" blackmail. Also, everyone here is hypothesizing of what can go wrong from blackmail as a fetish, but do we have any real bad stories? If the person is seeking to be blackmailed, then even if it goes "bad", they won't write on this thread to stop blackmail because its dangerous. They know they got what they were playing with, and they were prepared for the worst. If they weren't, they wouldn't have been asking to be blackmailed. Catch my drift?
Faskwa you obviously don't know what you are talking about.
"Blackmail is an act, often a crime, involving unjustified threats to make a gain or cause loss to another unless a demand is met. It may be defined as coercion involving threats of physical harm, threat of criminal prosecution, or threats for the purposes of taking the person's money or property."
As you can see by the definition, "true" blackmail doesn't always involve monitary gains.
As for real stories, just because you don't hear about them being posted all over here doesn't make them true right? Wrong. Most people who have a bad experience are forced to go along with it to the end. After that all they want is to run as far away as possible. So you won't hear their stories often. Fetlife.com has had more people come out talking about what has happened to them because the community there will tear the blackmailer to metaphorical shreds.
Your post here sounds like someone saying, "If she didn't want to fuck someone, why did she wear such a skimpy outfit?" I hope you realize that is unacceptable.