I think in Porsches case, They should just completely drop the Non S Models, Just keep the Carrera S, Cayman S, Boxter S, Turbo S etc, Those models always get the buyers/reviews/press/laptimes/ Porsche always pushed those models, Just get rid of the base, I don't see any point in them.
Options like that are abundant, And have been, But I think some are worth more then others, But is a Turbo S worth double the price of a Carrera S? or a Z51 to a ZR1? I really don't know, That's a hard question for me to answer, You don't get 2 cars, so its rather difficult.
The 918 was never ment to compete with any Nissan. And Porsche/Chevrolet/Nissan have been Upstaging people for MANY years know, Its nothing new, And im sure the trend will continue. The GT-R has ALWAYS been a Bang for the Buck, Even the R32 and R33, ANd I can DEFINETLY say the R34 is worth EVERy penny..I should know.