mining has always been speculation
in the early days the speculation was would it ever be worth anything - then someone bought some socks and a pizza
the volatility of the market also, up to $32 back to $3 and now $13ish
yes mining is becoming more "professional" and less hobbyist, but in the real world a lot of successful businesses have started that way
We are still speculating on Bitcoins future value though, no matter our investment into hardware or our status as hobbyist or professional