"Copying does NOT prevent him from making money. It merely removes a specific SALE from his revenue stream"
This is true, but doesn't removing the sale from the revenue stream have the same effect? I mean, if the copy can only be obtained by making an authorised purchase, then allowing a copy without the purchase reduces the *probability* of a sale, surely ... it just seems a little like technical hair-splitting to argue this way.
It's far more constructive to argue that without the free copies being available, less potential purchasers would know about the track's availability and thus less likely to buy anyway. That has been Corey Smith's experience. Or that without the free copies, potential supporters are less likely to be aware that the artist exists, which is more up our alley ...
But the essence of your comment is spot on. Well said.