same can be said for almost ANY product
First and foremost,
A)Apple develops these new parts internally, so the design can be a secret until release (no leaks). At that point, they could care less about the adapter, they want to encourage the accessory market in general, so they price high as to not piss off partners. Buy an accessory from Dell or HP it;s the same game.
B) if you paid MSRP, who's the dumb ass?
Your laptop may have an HDMI connector, but I'm sure it also has a GPU capable of more than 1080p too, and that's completely useless without a DP connector (which requires a measly $3 adapter to output to HDMI if you shop around).
SD card? Go Eye-Fi or use the cloud or a file sharing app, cards are so last decade. Also, what can you actually use one for? Not much when you have an encrypted file system, and nothing the cloud or apps can't do. The card slot and it's ability to mount some USB thumb drives (with an adapter) on your android is one of the thing preventing it from passing security muster and thus is keeping Android banned from banking, medical, government, and more uses. lol. You're most requested feature might kill android just how MS booted apple from Gov't and nearly killed them. Since 90% of people don;t need it, and because including it incurrs a royalty, creates a weak point in the chassis, and since SD is not a hermetically sealed port, it is left as an option for the few who insist they need it. BFD.
Laptop cases are free? other tablets come with one? I've seen clear screen protectors for tablets that are $20, and you're complaining about $30 for a magnetic locking, folding, good looking, cover/stand/cleaner?
that's cheap for a leather cover, most full leather cases a quite a bit more (if they're real leather and have good build quality).
The charger is $10 if you go to Target or Amazon, not $40 and it comes wWITH one of those, and a cable that charges every apple device since the first iPod with that connector 10 years ago. It also charges off most USB ports which even some new smartphones and no tablet other than Apple's can do. That said, what do you pay for other phone chargers, car adapters, etc? Every one on BBY.com apple.com, and target.com aside from a few no-name knock-offs is $30. that's the normal price, and why the EU finally insisted on a universal system going forward (which apple signed on to and promises no adapter required, not that they didn't already have a system universal across their entire line for the last 10 years)
I got a BT keyboard for $19 last year. Where do you shop??? Don't go there again...