I've heard that a lot of it has to do with "We have to advertise the position but someone on the inside is moving up." or something like that.
I've been meaning to look into meetups but haven't had much success in finding anything in my area. I did find a Ruby one recently that I could go to but I know nothing about it.
Where I live it doesn't seem there are many (if any) for developers. Starting my own is just my idea of a worst nightmare.
When I get done with the projects I've picked up lately I will look into it some more as a lot of times it isn't about how well you could do the job but who you know that can get you the job.