Batteries
" (Apple has been very successful in selling boatloads of phones with no sd card and a fixed battery)."
If you wander past a phone repair shop sometime, ask how much of their work is changing out the apple battery.
$HINT: A decent compatible battery is less than £10 (OEM = £20) and they'll charge you another 15-20 quid to change it out - not bad for a 5 minute job.
Walk into an apple store and they'll want about £90 for the same thing (that's what was quoted when my wife's iphone 4S needed a new battery), once they get it into their heads that you DO NOT WANT a new phone.