I agree with what everyone else is saying. My first thought was if you're really offering $1000 on a card listed at $3000, the seller might see it, chuckle or sigh and then quickly forget about it.
I don't use "best offer" when I sell on ebay, but I'll sometimes get an ebay message with someone asking me if I can take $150 for a card I have listed at $300. I get these alerts right away and often I am in line at a store or something when I see them. For an offer like that, I'm not going to drop everything and reply "no thanks" to them, so it will sit until I'm at home on my desktop and see it again.
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