Depends entirely on how patient you are. It'd be very possible that it could take a few years or more to get that many people that would pay to know. Are you willing to be out that much for that long? It would be pretty much a single use, single purpose tool. A foundry and or metals dealer could easily justify the expense using it daily in the normal course of their business.
I have tools that I could easily have lived without, were expensive and in reality get used very little. My bore scope is a perfect example, $800.00 and while I do use it and having it has been an education but do I get $800.00 of use from it? Maybe in a couple hundred more uses. For example, is your bore clean? Wanna bet serious money on that?
That's a lot of money Tim, think carefully that's not an $800.00 bore scope.
Rick