The hope is indeed that some will experience and believe: The purpose of a number of spiritual gurus is to demonstrate to God-fearing men faux spirituality.
Loo, life is black and white. You don't know what's good for you, because you don't see the black and white! You don't see where the black lines end and where the white lines begin! You're going to grow up to be no good if you keep on that way. It's impractical. I only have one child, and I won't have her growing up to be impractical. I can't think of a worse thing to be than impractical!
Here's a scary thought: What if God called you to give beyond your comfort level? Would you be afraid? Would you try to explain it away or dismiss it as impractical? And in the process, would you miss out on a harvest opportunity for which God had explicitly prospered you in the first place?