It's not.
You don't need to explain how to do it, you don't need to make an argument on time to implement - unless the time to implement is insanely high.
Use the language of business: You are losing prospects by creating work for them. Resolving this will help your sales funnel. Over time this could be worth substantial revenue, and contribute to the ultimate survival of your product. That is worth a lot more than how long it takes to implement or how to do it.