I see that's not a gold coin but brass so what's so special about those coins? Why would anyone pay 250$ for a brass coin? Do they have some historical value? Are they limited production? Anything else? Can't logic.
That's actually not a bad/stupid question at all - Here is a start.
http://www.coindesk.com/whats-a-casascius-coin/I won't bore you, but TL;DR - These are the some of the first and most trusted physical bitcoins made, are no longer produced, have documented/known mintage counts as well as how many have been peeled/redeemed etc etc... Great coins, love them myself but already have one of these!