Yobob is right it is about "saving" really... Paper, stocks, bonds, checks you name it can be produced out of thin air. Gold can not... Yet. Cash in a shoe box is good but the reality is that the world banking system which is based on inflating fractional reserves of nothing has reached it's maximum potential. It will collapse very soon and gold is the only safe store of wealth. period.
Because Gold is "real" money and the demand for money never decreases (only the availability) Gold's buying power for the most part is always stable over the long haul.
Gold is for "saving"
Paper is for "spending"