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Gelatine is a by-product of pig bone marrow which we have in surplus compared to pig meat consumption. Not one animal more will die when you decide to buy and consume a product containing gelatine. I mean, I respect the goal, but there's better choices to be made. If you want to avoid all products remotely containing pig (by-)product its a tough call. See e.g. book "Pig 05049" by Christien Meindertsma. She also gave a TED talk.

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The demand for gelatine would contribute to the pig meat revenue stream, offsetting costs and thereby (at least ever so slightly) decreasing the cost of pork, leading (in theory) to increased consumption.

Whether that effect is large enough to be noticeable is questionable, and I definitely agree there could be "better choices", but it's not exactly right to say that it has no impact.

If its like with whey, its in such abundance that they pay people to buy it. Either way, the revenue stream would be very little higher because of the huge abundance. You're much better off simply eating less pig meat.

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