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i was talking about average house prices and average fees. there are homes sold for more than 400k and there are homes sold for less. same thing with fees - you quoted the top fee that would be payable but there are many sales conducted at less than that (including foreclosure work that is done at 5% on the first 100k and 2% on the balance, listings that are done on a flat fee - and sometimes a pretty nominal one at that - etc.). regardless, the question isn't the fee but whether value was added for the vendor.
same for splits - some houses will charge as much as 50%, never mind 20%. it will drop, and sometimes greatly, for those agents that are more productive to induce them to stay. those that do become more successful will benefit from that but also become busy enough to have to employ support staff and assistants so the 20% is probably still a reasonable average.
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i'm not sure the "time to sell" is the sole criteria vs the value added to the transaction if an agent wasn't utilized. if you buy a car or a restaurant meal or new set of clothes, the transaction time can be pretty short for the fees and margins the sale price will cover. but those fees and margins also have to include all of the other overhead that is incurred throughout the rest of the day/week/year. that amount has to be reasonable/acceptable for both the vendor and the purchaser. it's not different with real estate fees, it's just that they're an itemized cost like gst that's easy to focus on. on the other hand, because it's easy to focus on means you should ensure as best you can that you are "buying the best" and, as noted above, purchasing elsewhere if you're not confident that's the case and that purchasing elsewhere can be as deep as "for sale by owner" or using the services of a group like purple brick etc. whether there is net value in that depends on your own expertise and availability of time.
as for ease of sale, a vendor and an agent can both contribute to the speed and price of a transaction using everything from cleanup to staging to pricing strategies but i've never actually seen a house "sell itself". even in the hottest of markets, a home that is poorly priced can sit forever if it's priced too high and even in the coolest markets a home that is poorly priced will sell quickly if it is priced too cheap. again, while time is part of the equation, what you're really paying for is expertise