Thought of it before, but not all banks lend you the money, and the borrowing ratio isn't high so the leverage of capital gain isn't high either. Decided not to go in afterwards.
http://www.ebay.com.au/itm/TIFFANY-ART-VENETIAN-GOTHIC-2-Oz-Silver-Coin-10-Palau-2013-/350727571986?pt=LH_DefaultDomain_0&hash=item51a8fe0a12
Is this crazy? That's $1800!!!