Yes. It does sound cheap! I guess with the recent turnaround in Perth the cheap suburbs within 10-20k's CBD have performed very well, probably due for some growth!
In above posts, when people say Logan, are they meaning Logan Central, Woodridge or suburbs within Logan City council? http://www.logan.qld.gov.au/__data/assets/pdf_file/0009/8847/Logan_Map_Updated_May_2012.pdf
Logan is a big area! I personally would invest in some Logan suburbs, not others.eg I like Waterford, edens Landing, Bethania and more, don't like Woodridge, Logan Central and more. they have a different feel and are probably price reflective.