Dreamers Unite!
I am inclined to agree John - Saw it explained/justified somewhere, but likewise fail to see any benefit to the biomed community. For the non-initiated it does seem to have the (I am sure unintended) effect of trivialising submissions/comments made.
At the end of the day though, it is a superfluous element in what is a very good discussion/exchange of information forum, and I take it for what is - a bit of fun on the part of those running the site, and an attempt to inject a bit more 'colour'