I think it points out the dilemma with storage. Apple rakes you over the coals for higher storage using the same rates that were used 3 years ago and not taking into account decreased component costs. Thus, going from 16 GB to 64 GB is still an extra $200 expenditure for a $20 upgrade. Apple can, of course, charge whatever they want. However, that does not mean that I, as a consumer, have to be happy with it.
In my day-to-day life, 16 GB is more than adequate because I have wifi, the cloud, etc. However, when I'd want more storage is for travel, which generally makes the cloud moot (hard to find or slow wifi, planes, etc). I also tend to use a lot of space while traveling with photos I load from my DSLR. Then the question becomes, do I stick with 16 GB because it is good for 90% of my usage, or do I pay through the nose for that 10%?
You just answered your own question. If 16GB satisfies 90% of your lifestyle, then paying "through the nose" to accommodate the remaining 10% doesn't make sense financially. Then again, not everyone has the same amount of money to blow on stuff like this. For a lot of people, just having an iPad is a luxury that they cannot afford, let alone mulling over which storage option suits your lifestyle best.
Except it's often not just 5 hours; it's 5 hours there, 5 hours back. And then the 1-2 weeks in between the outbound and return flight where you don't want to pay the roaming rates to stream videos from the cloud.
Is this an example of a business trip or something? I am assuming you would have a laptop as well, yes? If it is a business trip, why are you spending THAT much time using your iPad to where 128GB is not suiting your entertainment needs? Shouldn't you be doing...I don't know, work?
Is this a personal trip/vacation? Again, why are you spending THAT much time on an iPad?????