I don't think you get it. Most of us here are after the same thing, a nice looking car ---> hence why we got bonneville'*
A lot of the people here have done very original things to their cars, we have to because the aftermarket for the bonneville is small (except for the engine). We are in no way against customization, we are probably one of the most custom car clubs out there (maybe).
Its not that we are against wings, but we PREFER parts that add to the car, not take away from it. The only thing that wing will ever dream of doing is looking good up there, and 99% of the people on the forum do not think that it even does that.
Its not performance related (but I hope you know that, and I think you do), we don't think it looks that good, so we don't see any purpose for it. In our eyes it only adds weight and takes away from the looks.
But it is your car. Feel free to do what ever you wish. I would rather someone have a backbone and not do what everyone else is doing, but this is just the logic of it.