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I'm sorry but dibs mean absolutely nothing. Seller has no obligation to sell to anyone just because they've expressed interest. If money hasn't changed hands then there's no deal yet.
Yeabut, dibsing, following up with a PM to discuss payment and timescales and agreeing them is an agreement, and both seller or buyer could be rightfully pulled up for being a dick if you renege on the agreement.
(not entirely sure this is what happened here, the best bet for the seller in the situation where payment will be funded by the selling of something else, is to specify a timescale for when the money must be with them, or they go to the next buyer etc.)
I'm sorry but dibs mean absolutely nothing. Seller has no obligation to sell to anyone just because they've expressed interest. If money hasn't changed hands then there's no deal yet.