ORIGINAL: LBR
Duc, the catch is I can pull off shots with my longbow that would be difficult, if not impossible, with the compound. I can shoot with my back to the target, lying down, with the bow horizontal, drawing from behind my back, aerial targets, fast shots,etc. 'Course I won't be as accurate, but I'll be more accurate than most anyone with a compound that has to get in an awkward position--some of these are pretty much impossible (at least without risk of injury) with a compound.
Some of those would serve no practical purpose, but some would. Most traditional-only tournaments have shots where you have to kneel down, squat, stretch out, cant the bow at extreme angles, etc.--just like you might have to in a hunting situation.
I have another one for you. I'll bet you another cold drink that my bow is faster than the compound of your choice. **WARNING--there's a catch to this one too**
Chad