They have probably hired a broker to represent them in the sale, like a couple we have in our state and will SHOW the property to get their cut..
I get that part of it....just never had anyone bring one...and we've had about half a dozen showings in six months (all after we dropped the price about 10%).
I guess my point is that I don't think a broker would not spend the time to represent someone (and travel for hours with them on a weekend) unless he thought they were serious, and not just wannabes without the financial wherewithal to follow through....unless he's a friend or relative.
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