Do not approach large brokerage firms as they are in the business of collecting double commissions and rarely will negotiate. (caare.org)
The result is that online home buyers can only find those listings on the company website thereby dramatically increasing the frequency of double commission transactions while decreasing market exposure of those properties. (caare.org)
Finally, working with the listing agent usually just means they make double the commission and you don't get representation so most of the time it makes sense to have your own agent. (biggerpockets.com)