Is that true though? I don't think it really matters? DNG, REA, Sherry, O'Brien, etc. etc. are all just a name on a sign to most people.
Nobody will buy a house based on who the agent is. Much like no one will avoid one based on who the agent is, either.
If a house comes up, that you're interested in, the name on the sign is the least of your concerns I'd imagine?
I’ve not looked at houses being handled by one agent in my locality as I know for a fact that he’s a liar, inflates house prices in the area and he’s an odious toad that I’d rather not deal with. If that means I miss out on a house then so be it, life is too short.
Then there’s another who made an absolute balls of a property she was handling and even though we were offered the property in the end and had already gone sale agreed elsewhere it wouldn’t put me off viewing a house she was showing. It would put me off selling a property with her and her agency though.