I've always thought that online matchmaking is often an voyage through social purgatory.  There are some well-adjusted and interesting folks here, to be sure, but they are often hidden under many layers of those who are not.  I think most come to this process with the expectation there will be some effort made at self-selection.  You read someone's profile and then make a decision about whether or not you ought to talk to them.

I think the problem is that there are many people that don't understand this process.  I've identified three possible causes.  One is that they lack self-awareness and the ability to make a self-assessment that is alignment with reality.  They think they are someone different than who they are so they believe they have found a match when they have not.

The second cause is that there are people that do not know how to make an assessment in the first place.  They only see people and desire them based on what they look like, and send a message that is informed by their desire and has nothing to do with what the other person wants.  

Third are those that are aware that self-selection ought to happen but choose to ignore it.  They message every new person to this site.  It's the spammer's approach: I may send out a hundred messages that are ignored but all it takes is one.  And the hundred messages doesn't cost me much (especially for cut-and-paste) so I can do this all day long.

The chief problem with the approaches above, especially number 3, is that it annoys the entire population of the site.  It degrades the experience for everyone to the dubious benefit of a few.  It renders this experience of Collar Me as barely functional.

The recommended solution would be to limit the number of new contacts each individual can make.  I only contact a few people per month.  I really can't see any reason why more than one new contact per week would be necessary but I suppose one per day would be reasonable.  

The socially clueless might argue that most people don't write back, to which I would argue that if they received fewer messages that were higher quality and actually relevant to their interests than the response rate would probably go up significantly.  Then the clueless might need to start investing some effort into their messages.