Y'all are missing the point... I'll use bullets to help make it more obvious:
- Many men get vasectomies.
- These are generally permanent.
- Some men may want the same effect (i.e control over their fertility or lack thereof) without the permanent aspect of it.
- These men will pay for this product, should it be developed.
Voila! There you have it. Considering how much this sort of research costs, chances are that the company involved has done the marketing research and arrived at the same conclusions.