To turn the question around, the aspiring bidder here clearly thinks EAs add value, because he's very keen for it not to gio through an agent who might find a higher bid than his own.
An EA should be able to get you a higher price, yes, and perhaps as much as 20%.
One thing I have noticed recently is that complete wrecks seem to be as sought after as newly renovated places. If you didn't realise that, you might think that grandma's desperately tired, in-need-of-gutting semi needs to be discounted to sell, in order to reflect the cost of gutting it, when it actually doesn't.
By way of example here's a house local to me. As I noted, it has an outside loo, no room upstairs for more than one bathroom, a 9' by 9' kitchen, and it hasn't changed hands in 92 years. This probably means it hasn't been modernised in 92 years either, hence the outside loo.
https://forums.moneysavingexpert.com/showthread.php?t=3403965&page=1212#24224
It's gone under offer - for £1.25 million - within two weeks, which is £50k over the asking price.
Given that it needs everything doing to it, if you were the seller, you might have thought Well, I'll never get £1.25 million...I'll flog it to the nice direct buyer at £1.1 million instead, and save myself £20k in agency fees. If you had - you'd actually have lost yourself £130k.
Nothing stops the vendor here from instructing an agent and saying Right, get me a bid that is higher net of your fee than this one I've already got, and I'll take your bid.
Buying a house, if you believe the market has a way to fall, or if you are paying sill asking prices ( like some sheeple ) or if you are buying in London, is now a massive financial gamble!!!!! - June 8, 2012 by TheCountOfNowhere