Hi Spiderman,
This is question we do get asked quite alot, all fee's are negociable to a point, & they are higher than the Eastern states, l have also noticed.
With our fee's we do look at the area's like you have stated, and l hope you can apreciate that some area's are "higher maintenace" than others, and no matter how hard you try to check prospective tenants out, which we do very carefully, there are always some bad ones that slip through the net and cause trouble for the landlords.
Which is terrible for us as agents, and even more so for the landlords,our policy is to do that little bit extra with these area's such as more drivebys, intruducing ourselves to the neighbours, and really keeping an eye on rent arrears, this way (which all PM's should do) you are not leaving situations untill they are at a point that it's too late to fix, but are nipping it in the bud.
One day behind on rent, we ring them and find out why, and work with them rather than against them, encourage them to ring us when there are problems with rent arrears, etc, we have found our rent arrears list has halved due to our Pm's being on the ball, and we are very proud of this fact.
We are not perfect, but we do try, we contact our owners and let them know whats going on as soon as any situations arise, so its not left until its to late.
If we do charge a higher rate, we explain that if the property is lower maintenace we will ajust our fee's to the rate of areas such as Tarcoola etc.
Working together is a good starting point, and "Communication" is the key...