So you're saying the only reason anyone gets deep wheels is either for the looks or the placebo, for all other purposes they're completely useless?
Then again, some people can't tell the difference of adding 2 or even 3 kg to the bike and then find som scientific survey showing that the mathematic difference is only 0,xx seconds over x km of distance, supporting their theory that everything is placebo if they can't feel it themselves - while others claim that 3 kg extra on a bike, which on this forum is like 40-50% extra in some cases is night and day.
It's sort of not the first time 'everybody else' seems to suffer from a hard case of the placebos'...
As for what the pros ride, how often do they race solo on a flat course? The advantage of deep wheels goes straight out the window when riding in a group, and as for training solo as a pro they ride to get better - not to have fun, low-profile wheels have better comfort and I bet most pros actually do a fair amount of their training in very hilly areas.
So just because something suits the riding conditions of a pro better, doesn't mean it's the ultimate solution for everyday Joe. But if you are fortunate enough to do your training rides in france, gran canaria, northern italy or likewise - for the love of God don't use deep wheels!