That's what happened for me certainly.
I agree...i have been to all of them and the early ones were just a handful of vendors mostly with new stuff so if you had it already there wasn't much to get.
now with people bringing personal stuff it makes it a whole lot better since people have older stuff or out of print stuff they don't want. I know the last one someone was selling some 90's industrial, punk and hardcore records. Once word gets out that people are selling parts of their collection hopefully it brings more new blood out.