Imagine a new email comes in from a potential client or customer asking about working with you. They're asking for a proposal for some custom work, a commissioned piece, or an on-going service.
You're excited! A new client is just what you need!
You want to get everything just right, so you spend the next 30 (50?) minutes carefully crafting a reply. You eagerly await their response and then...nothing.
Ever had that happen?
Now, not only did you not get a new client, but you burned valuable time and energy as well.