Nope, yeild will not increase. Thats like taking away one of Fords factories then expecting them to make more cars. Big fan leaves are whats harnessing the light energy no make the buds grow, so taking them away would be terrible! I wouldn't even "try it out" on one plant, it's just simply a bad idea. Not only do they collect more energy, but they act as a buffer for the buds to protect against nute def., pest and disease. If something should go wrong with your plant, it'll go wrong with the big fan leaves first, take off the fan leaves, when something goes wrong with your plant, and the problem will manifest itself in the bud instead of the fan leaves. Sometimes I position some fan leaves so their shadow doesn't fall on any big buds, but thats about as much as should be done with them.