$2 exactly? and you know this how? meanwhile, not everyone will need it. plus there are other adapters (ie basic usb to usb-c, etc), starting at $19....
$2 even does seem a little steep for production. With a couple bucks over here in Asia for you can get quite far.
for 2 bucks:
- 8Gb Micro SD
- 2 pieces of silicone bumpers for the iPhone
- a two meter lightning cable (white) or 30Pin cables
- a lightning cable with woven cableprotector
- a small USB BT4.0 dongle
- a 4 port USB2.0 hub
- various models of cheap in-ear headphones including microphone and volume control
- 2 pieces of original-looking iPhone adaptors
- Screwdriver/plyers/... set for opening your iPhone
- various other USB hubs/adaptors/convertors/cables/etc
Let's be crazy and spend 5 bucks:
- USB 2.0 ethernet adapter (featuring a real Apple 'look')
- MBA neoprene carrying pouch.
- a original-looking iPad adaptor with 3 USB ports
- Better quality earphones (like the Xiaomi ones - not bad at all)
- 2 pieces of iPhone 5 earpods (they call it the 'OEM' version hahaha)
- Various iPad adaptors (VGA / DVI / cardreaders / sound etc) original looking
- Replacement battery for 4/4S/5/5S.
Granted, these are all Chinese knock-offs, but these are RETAIL end user prices in various malls. There's not much profit margin on these, but still, production costs are just a fraction of these $2 dollar items.
Watch out though, these 'original-looking' $1 iPhone adaptors are the ones which came in the news that caught fire last year.