I've been to all of the San Mateo Maker Faires since their inception a few years ago, and it seems to me like things have been getting more commercialized. At first, the majority of the people at the faire were one man outfits or small groups showing off their cool stuff, now the big names like Farnell and FTDI are starting to move in, and it's just not the same anymore.
Many of the cool demos from previous years weren't there this year, such as the hotdog roasting Tesla coils or the fire sculptures. There's even far fewer people dressed steam punk style than there were in past years.
Regarding the electronics aspect of the faire, my son summed it up well when he said "Dad, this isn't the Maker Faire, it's the Arduino Faire." Aurduino's everywhere with almost nothing else in sight. That, plus the sheer number of people showing off MakerBots of one form or another and the Maker Faire is quickly becoming focused around only these two areas.