a bad bet.
[1]
as @p0peji says: part of the pot denominated in coin, you stand to lose more than him (should've been 100% beer
)
[2]
no time limit specified, he can always state
"oh it will rise in the end, lets just wait" and then die. You cannot do the same if it breaks above $1500.
[3]
you're probably on the wrong side of it.