Mmmm ... because even with sleeper seats the seats are still 6 across with 18.5 inches width? Really, unless I'm on a redeye I'd much rather have some elbow room to stretch out, have another Woodford, and get some reading done than more pitch than, oh, 40 inches or so.

The biggest disservice domestic airlines did to F-class travelers was way back in the 80s when they decided that removing one seat from a seven-seat row to design first class was the same as removing two seats from a six-seat row.