Not to disagree here, but I've scrapped several cars, and buy and flip them all the time. The reason you get the bad response to the offer is because
You aren't the only one sending this email offering scrap value. I've sold several cars under $1k and 9 of 10 emails I get are scrap priced offers.
Once again not disagreeing with the thread, or your post.
I'm not much of a phone person, and deal mainly through email. People get very angry with me over this, calling me a spammer, and the like. If they are interested in what I'm selling, they can email me, and I'll promptly email back, just the way I work.