It sounds like you should not make your project open source, because there is no compelling business reason to. You only cite a speculative benefit of potential

It sounds like you should not make your project open source, because there is no compelling business reason to. You only cite a speculative benefit of potentially being able to reach more customers, but it seems like these are not the people actually interested in buying your product. So I think your assessment is correct, it does not sound like a smart thing to do.