Tubulars don't roll faster. It's a fact that high-end clinchers have lower rolling resistance than high-end tubs. Most folks ride tubular for the ride quality.

I ride tubulars on my fixed and road bike because tubular wheels are lighter I can use insane low PSI without pinch flats. Tires such as Michelin PR3 handle as well as the best tubulars so handling is a moot point.