Regardless, the saddle in question is already to market, and while at the upper end of the market, is definitely not the most expensive saddle you can buy, so I don't see the relevance of your comparison. The manufacurer already decided the costs were worthwhile with the heating element built in.

If only from the perspective of convenience, it's hard to imagine choosing a design you need to remove and reinstall the saddle for molding over one with plug-in, in-situ molding.

Of course the idea that engineering an oven molding process saddle would necessarily lower manufacturing cost is both purely and highly speculative.