nate summed my view up pretty well,
but food for thought:
hoard/hôrd/Noun: A store of money or valued objects, typically one that is secret or carefully guarded.
Jesus gave a parable using talents, here is an excerpt:
Matthew 25:24Then the one who had received the one talent came and said, ‘Sir, I knew that you were a hard man, harvesting where you did not sow, and gathering where you did not scatter seed, 25 so I was afraid, and I went and hid your talent in the ground. See, you have what is yours.’ 26 But his master answered, ‘Evil and lazy slave.....
if it isn't a sin, which I don't think it is worth arguing about, it is definitely foolish