No you're not crazy. I'm also extremely sceptical of them .. I'm 5'8 and have a current lean body mass of 132lbs. I would look horrible (and be dangerously sick at) 140lbs.

My long term goal of 176 puts me still in the moderately overweight category (same as you actually!) .. but I think it's healthy, especially as I'm working hard at gaining more muscle.

Just go with the point where you feel healthy..