Because they should be fitted as far as i am concerned. Like i said, it's just my opinion but i feel for the price of this car if you're going to chuck another 2.5K at it then they should have the Recaros as standard too.
Thing is, no other manufacturer offers seats as part of a performance pack or any kind?
The argument of cost can be applied to 99% of all cars tbh. My S4 has the supersport bucket seats, that was an extra, my Porsche has the upgraded seats again that is an extra.
If I wanted to get powerpack for my Porsche that would cost me 6k and doesn't include Seats. When i was considering a megane, their bucket seats are not standard, they are an optional extra.