When I reach out to make offers on BINs, I will star off by saying something like, "That's a great card, and I hope you get for it what you are asking. But if after a while, you've not yet found a buy, I'd love to offer $XX.XX."
That way you're not implicitly insulting the seller by trying to low ball them, you're wishing them well, and offering an alternative, if they should consider revising their price. I've never had a negative reaction to this, and a few times I've made a deal.
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