whats the point of getting nappa leather in 640i gran coupe or coupe

i just noticed on bmwusa that if you order nappa leather ($3000) you have to order leather instrument pannel ($3000) so basically $6000 for extended leather.
on the other hand you can get Full Leather Merino individual leather for only ($5000). a savings of $1000 plus the whole interior is leather including lower door area, glove box lid, under stearing wheel area.