Buying one of these

[timex]

Big Coin

Perhaps I'm just drawn in by the size of this giant coin, but does anyone think this would be a reasonable investment?

I am primarily wondering:
1) How is the gold market currently?
2) Are there long term predictions for it?
3) How long term are those predictions?

Also, if they only make say ~20-50 of these, is there any chance that 20,50, 100 or 500 years from now, they could have much more value than the value of the gold?