This post is nothing more than propaganda to protect established designers from competition (those who are starting out or are just not very good at marketing their skills). Perhaps this was not the author's intention but it is the consequence of his reasoning. I don't think many designer want their profession to be protected by a trade union and this kind of mentality is what leads to it.

I say, if you are not an established designer with a large base of clients, do participate in the contest!