R & D is factored in when deciding what to charge the customer.
I don't know why you're so invested in the idea that a halo product would pay for itself, to the point you'll just insult a long-standing fellow member of the group.
1) what was the development budget
2) what was the unit cost
3) how many did they expect to sell
4) how many did they actually sell
5) how did they get #3 and #4 to be the same number or even within a factor of 2x
6) once they fully paid off the R&D, why not continue to sell the lens at a massive discount, assuming the R&D was high and now totally paid off?
7) why didn't they do another lens like that?
8) why didn't Nikon or anyone else do another lens like that?
And most importantly:
9) when so many other industries have halo products, how are you so sure that it's out of the question for an optics manufacturer to have one? I'm happy to hear you out, just cut out the snide remarks and explain how you are so sure. To be clear I'm not stating as a fact that it's a halo product, merely that it seems EXACTLY like the halo products in so many other industries.
It certainly looks like the equivalent of a photographer going the extra mile to get an eye-catching shot a customer won't be paying for (or won't be paying extra for), but serves to attract attention and draw in new customers. Have you never taken such a shot? If not, is it impossible to imagine a photographer doing that? And if a photographer can do it, why is it impossible to imagine a firm doing it? The automotive press is absolutely full of such stories--Subaru SVX was sold for $3000 less than the cost to make them, but it was a halo car designed to get shoppers into showrooms. Buick Reatta, similar story. Ford GT 2-seater, same story. Toyota 2000GT (as seen in the Japanese Bond flick of the 1960s) same story. Toyota surely didn't make money on the Supra Turbo of the 90s, as they made it for 8-9 years with zero updates then discontinued and didn't introduce a follow-on for a decade. And yet that Supra still keeps Toyota on the minds of car fanatics the world over, with clean examples trading for up to twice what they went for new and still winning at the drag strip and still a top dream car of the tuner scene. As advertising you could hardly do better.