No you're also paying for the opportunity to pay $thousands per year to keep it running. I bet they have really good coffee in the customer lounge though!
I had a pla with a Boxster who got to put in a new transmission at 30K miles. Of course his went while on a cross-country road trip. My anecdote is definitive data!
Kidding aside the main value you're paying for IMO is customization. You were able to order your car just how you want it. Porsche is known for offering nearly unlimited customization (so is MINI so you still could have saved big if that was what you were after). Miatas OTOH are mass produced in a limited number of colors and configurations and you can pick from the 2-3 different combinations on dealer lots. Don't ask about ordering, but trading may be possible. When I bought mine I wanted a specific interior and exterior color combination... power hard top, navy blue exterior, tan leather interior, and manual transmission. My dealer had to trade with one in another state to find one. If I had wanted a black interior and automatic transmission (sad! but true) I could picked from any of dozens on local dealer lots and probably got a better deal too.