Phoenix is easy to flag down with a lot less flags... anon managed to get 100+ posting ids reported on a single TOU violation report last summer, and 30days or so later CL admin wiped out nearly all the cult ads in Phx in one big swoop. they've slowly built their listings back up since then, but it seems as if their still on probation/penalty phase of some sort because as soon as flagging ops & CL raids come into vogue, their ads go bye-bye right quick.
Thus phoenix hasnt gotten back to being as bad as they were with the total number of ads previously ranging between being bigger than atlanta but smaller than houston.
archived copy of the TOU report that gave us an edge in phoenix and few other spots is archived under the "messageboard" area of the ClearClaig MV site thats used for CL flagging raids: http://clearcraig.scientology-violations.net23.net/
^^note the number of ads indexed under there kinda disagrees with this thread title... more often than not, scilons are still running wild on CL for the most part and there is more flagging/reporting effort needed - especially in boston, atlanta, and houston (los angeles too but there is so much infiltration there from lots of different sources its likely hopeless).