Who cares about the rice factor? Go to any local track event (PCA, BMW, etc) and look at the cars.. 98% of them that have racing seats have only 1.. The people that have 2 either have a passenger usually, or were concerned about looks. But some of these seats aren't cheap (Porsche GT3 seats are $2200 *EACH*), so it's function before form.
At least this Probe guy's passengers get to enjoy some confort. If I picked up my date in a car that had racing seats, I don't think she'd be real happy about that.