I agree that you don't always know when you purchase something what you're going to use it for. I got the 16GB iPad and never ever expected to run out of storage space. I didn't know about all the great games you could play on it, and how that (together with ebooks and other stuff) really adds up. If someone had asked me what I'd use it for back then, I would have answered "web browsing and reading ebooks". That changed in the first couple of months though. In hindsight I really wish I had at least 32GB.

A similar thing goes for the laptop/desktop example given above. I recently bought a laptop for my parents and the salesperson tried to talk them out of it as well, because they weren't going to travel with it. I think a laptop (with an external screen if it is used a lot) is so much more useful for most people than a desktop, simply because of it's portability inside their home, even without any travel. Now they can sit next to their partner instead of in the separate computer room upstairs. Or (if there was no computer room upstairs) they can put it in the closet when they're done and don't have a big computer taking up space in the living room all the time. And it's way easier to take it with me on public transport if there's something wrong with it. I really felt that the "are you planning on taking it with you while traveling" is the wrong question when it comes to deciding between desktop and laptop, especially for most people when the extra power that a desktop gives is totally insignificant for word processing and web browsing. A laptop (not a top of the line one) was definitely the best option for my parents, and I'm glad I was there so that the salesperson did not succeed in talking them out of that with the best of intentions.