evisional - consider this "hyperthetical situation". you are new to the landlord market. naive and inexperienced, you have an investment property and find a real estate company to manage it. they are not really interested in collecting the relatively small management fees (100-200$/month)- they are more interested in trying to get you to sell the property through them and received a sellers commission of 10-15 K (it would take them 10 years to make that money through managing the property).
so what they "may" try to do is exert underhanded pressure on you without you realising it. the property "may" sit vacant for a while, they "may" find lots of repairs that are required, the "may" do repairs through their own repairers and overcharge (real estate agent "may" ask repairers to charge a little extra and then ask for a commission back), they "may" get in poor tenants knowing they wont look after your property etc.
again, "hyperthetically", the ongoing costs of managing a property "may" be kept to a minimum for them. legitimate problems "may" be ignored. inspections "may" be ignored. one property manager may be looking after hundreds of properties so loosing a few here and there is not really a concern.
eventually (and hopefully for the real estate agent) it "may" get to the point where you think it is not worth having a rental property and then decide to sell. now they "may" tell you it is a great time to sell and that they have "buyers lined up". they "may" tell you you property is worth alot more than it is. they "may" encourage you to use "marketing packages" worth thousands of dollars to assist in the sale. if it does not sell, it does not matter as they have already made a large profit just on marketing alone.
hyperthetically, a real estate company could do very well using the above tactics. they could open up agents all over brisbane in a relatively short period of time. they would however, have trouble staffing and you may find that the turnover rates of staffing would be very high and that very young and inexperienced staff may be managing hundreds of properties.
this is all just hyperthetical though.