You know what would be great is if the poll also included whether the trader was profitable or not as well in each category. If everyone gave honest answers.
For traders the I types are best working at home by themselves while the E types are best working on the floor or on teams. The N types are best at designing systems while the S types are best at executing them and following rules. So in theory, when you're at the stage of designing a system you'll do better being a N type, but once you have it you need to become an S type to use it. This is where most trader probably fail at. People who start out as an N type may be able to design a great trading system but then have trouble with using it. It's not a surprised that so many traders would be this type as designing a system would let them flex the N part of their personality. S type probably wouldn't be able to come up with a trading system by themselves but if they could find one then they can become good at using it. They are like mechanics, they can be great at fixing an automobile but you wouldn't expect them to design one. The T type are best at logical decision making, while the F type would rely more on gut feeling. T type can potentially have trouble with over analyzing things, while F type could get in trouble if their gut feeling isn't backed up with experience. The J type would be the good at quick decision making but have a hard time dealing with the chaotic nature of the market because they need to have that sense of order. While the P type would have trouble making decisions but would be more at ease dealing with a chaotic environment. Ultimately, your personality type has little effect on your trading performance, what it comes down to is your maturity and discipline that matters.