I'd prefer things to be more centrally located, but realistically, this venue is nine miles from the heart of Downtown LA and it's incredibly easy to get to either via car or bus. The main promoter of this show lives in the San Gabriel Valley so I'm assuming that's why he tends to book shows out there. It probably also comes down to cost, venue size, and a whole bunch of other bullshit.
I kind of hate the LA mentality of "if something isn't downtown or in Hollywood it's too far away". I live in Norwalk and everything is far away for me because I don't drive. I'd prefer that shows happen in Norwalk or Downey but if I started setting them up people would bitch about how far away it was, even though it's like 14 miles down the 5 from LA.