I do about 90% domestic but layer in a few international flights per year. Normally 6-8 hours but some as long as 13. My last flight back from China they moved my seat to another one b/c the entertainment garbage was broken. Dropped from a reclining exit row to a center seat next to a screaming kid. Awesome. Never turned on the TV. Was not allowed to sit in my original seat - it stayed vacant.
For entertainment - pack an iPad, Kindle or magazine. My tickets cost more because of the terrible in flight entertainment installed on every seat.
Short haul - you can pack you own food and drink and pack out your own trash just like a bus or taxi. The point is that the Flight Attendants are useless on short haul. The food and drink are irrelevant. Sub a bucket of free waters by the gate and I am happy.
Long haul - I agree that at some point you need food and drink. On trains you get meals at a central location. I would prefer this over ever seeing a flight attendant again. If they must exist ban them on flights under 3 hours.
For payments - no cash, credit only. Currency problem solved. Charge a reasonable price for food and drink and see the volume drop by 90% overnight.
First class is a different story. The flight attendants tend to be polite and well trained. They don't enforce idiotic rules and they don't wake you up.
Last up - break 1 finger every time an airline employee uses that horrible PING intercom system to communicate. If I had a dollar for every time that thing woke me up...
Since you don't seem to fly international much at all, flights don't cost more because of the entertainment. They have pretty recent and at times in theater moves. I like it, I'm not a 13 hour flight. i want a variety of things including my Macbook, iPad, and iPhone.
International flights are seasonal, during vacation times they rise.
For the food, I'm not going to pack my own food. I'm not keen on airplane food but i definitely don't want to have more luggage or stuff to carry then i have to.
since you don't have a lot of experience traveling internationally. Hell no i don't want people to bring their packed food. I've experienced ethnic foods brought on to airplanes, in that confined space, it's not pleasant to smell.
In all my travels, i never seen the Ping systems used when not needed.
About the first class thing, i guess you haven't read my post AT ALL. There was problems with the cockpit instruments, EVERY passenger turned off their devices, in their pockets, on hand, and in their overhead luggages.