Because it is a challenge. I have been flying RC for 45 years and thought I had seen it all. But a visit to an indoor show introduced me to 3D. Paul Heckles was "flying" a Limbo Dancer with a MDS 38 in a 40ft high 100ft round area. Hanging, high alpha rolling circles, tail touches, wow just blew me away. I went out and bought one. I still have it and the covering is faded.

I have a range of models from 1/4 scale bipes down to 6inch span TEE DEE 010 deltas, but my 3D Sledge gets more airtime than anything else. Why because it is fun and I still can not do a good low torque roll.