Aesthetics, efficiency, plus it forces you to land properly rather than wheelbarrowing it in (or, you could say a 3 pointer is a pleasure rather than a sin..) Besides, who cares about logic
Aesthetics - see
Air-Britain : D-MESB and compare for yourself.
Efficiency - plus 6 kts in horizontal cruise or 12 ltrs consumption at 105 economic cruise. (129 Vmax).
Logic? Come on, most of us are married. We know what logics mean if it just comes from the right person, don't we?
wsn