>I agree. But I don't think it generally needs to be more than: "I have written a product called Product XZY which allows you to blah blah blah."
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>Then the person knows it is their product. And upon investigation can find out that it costs however much.

There is a way to make a reference to a product. It is always good to know about possibilities out there on resolving or enhancing specific issues we have to deal with on a regular basis. It just must not look or give the impression that this is a spam. Such individual posting such content should also be aware that we have a News section for that purpose. So, a simple reference would have sufficed in the message, with technical references if applicable, but all the rest about the promotion and pricing, would fit better in the News section.