Having a shorty in the pot makes this call tougher than you think. they can really screw up your chances of stacking the big stack, and remember, if you don't stack him almost 100% of the time when making a 10:1 call. You don't just account for when you hit your set, but what about the times you hit your set and still lose? If he fails to stack off once, and times you hit your set, you will get set over setted, or beat by a better hand, this all adds to the calculations.