The first is “it’s been done before.” If it’s been done before, then it’s not new, or even news. Regardless of how necessary or important it might be, an everyday offering available anywhere will, out of necessity, compete on price and likely for attention and energy too.
The second reason people won’t buy into your idea is “it’s never been done before.”
The good news is that there are all kinds of people looking for something that has never been done before, and when they find it, they’ll share the story with anyone who will listen.
If your idea has never been done before, you’re probably onto something. Don’t worry about attracting people to your idea. Worry about creating an idea that is so appropriate it attracts people.