I'm trying to picture the purchase or sale of a home for the average joe (who can count on one hand the times they'll do it in their lifetime) and it's tough.
Gone are the days that buyers feel they need an agent to "find them" a house. Buyers find their own house. But an agent provides access to that house, and guides the buyer along in a transaction that is, for the average joe, intimidating and complicated.
And really, I don't necessarily believe a good agent can "sell" a house. Houses sell themselves. Location, prices, etc. Are good pictures and an enticing description important? Absolutely. Will they alone get potential buyers in the door if it's overpriced or in a warzone? Nope. Listing agents don't "sell" houses. Listing agents coordinate showings and protect their sellers assets. Letting strangers wander around their home is not something most people are entirely comfortable with, but for some reason the presence of a licensed agent comforts them. Then the listing agent guides the seller along in a transaction that is, for the average joe, intimidating and complicated.
It's not the access to information that makes the job of a Realtor, nor is it even the mountains of paperwork, I think it's the access to the house. The rest of it all? Perks. Perks that cost 6% ;)