There's no magic answer, this is where a little detective work can go a long way in regards to sellers motivations, starts with just opening a conversation with everyone connected to the sale or living near the property.
If I was going to live there I would visit at various times of the day and night just to be safe, there are a lot of housing commission homes nearby including six commission houses directly connecting or very close to this property, should be fine but you'd really want to double check that. For an investment I wouldn't be as concerned as I'm sure this area will continue to gentrify and these houses will be sold to renovators or first home buyers at some point.
Don't want to discuss the numbers but a little digging here will bring up plenty of useful comparables. Even very nice houses aren't selling quickly if the price is a little wrong these days and sellers still think it's 2010, though property is still selling and anything that appeals to first home buyers or upgraders is much better placed than investor stock at the moment.
If Tracking Residex Monthly House Index for Brisbane
June 09: 12.10 $568,000
Mar 11: 11.98 $562,204
If Tracking ABS Quarterly Index
June 09: 142.2 $568,000
Mar 11: 148.3 $592,366
Assumes reasonable price paid initially and no value add (large assumptions and not a suggestion of value)
Good luck with your house hunting