If a man has a box, doesn't tell you what's in it, doesn't let you hold it, doesn't even let you see it, but he tells you that this box contains something valuable and it is worth a lifetime of devotion. Do you devote yourself to the mystery box? Or spend your time doing something else?
That's why people are skeptical. Some people see the idea as a mystery box and may not be worth a lifetime of dedication. So they pursue things that they can see, feel and know for sure.
Everyone sees the world differently.