Most people don’t want to deal with the hassle of dealing with seller agents when co-ordinating viewings of flats (4). Often, if you make calls to ads in the classifieds, you may be told the unit is not available anymore, and are asked “Do you need help looking for any other units?”.
Actually, the unit never existed, and agents do make bogus ads to ‘fish’ for buyers requiring their services. By saying you need help, you are verbally engaging them for their services.
There are also cases where after you view a flat and want to put down a deposit, the seller’s agent will demand that you pay him a commission too. If you refuse, and make an offer, you’ll get a phone call later saying that ‘the seller has rejected your offer’.