In reply to Miroslav Glavic.

While not as inexpensive as a WordCamp, $50 is really reasonable for a one day conference. Have you ever priced out any other conferences?

PHP World, $700 for four days
Css Dev Conf, $695 for 3 days
HOW Design Live, $1995 for 4 days (lol, seriously)

Most conferences, including those above, have early bird rates that are cheaper, even so, they are still more expensive than $50/day.