Now it becomes a speculation on LTC price rather than an investment.

With the current difficulty, 110 MH/s can mine around 70 Ltc a day and 490 Ltc a week. That's 490 * 40 = $19600, but we all know $40 is very high and a crash may happens any time. But the opposite may happen too and the price may keep increasing. Anyway this contract is just like buy 490 LTC in 7 days with $18000 ($36.7 per LTC) if the difficulty will not change soon.