Buying an entire prosciutto costs hundreds of dollars, obviously people don't want to buy a whole one.

It's also usually not heated, by the way. This has zero to do with not liking to prepare meals... most people who buy sliced prosciutto are doing it as part of the meal they're preparing. We're not talking about hot pockets or frozen lasagna here.

That's a lot of food waste. Heck, I sometimes lament that I can't buy smaller amounts of spinach because I hate seeing half the bag go to waste.And I'll add that this has nothing to do with cooking or not cooking: I like to cook, and do so most days.

That packaging keeps food waste down because it breaks things into smaller portions - not to mention that many food places seal them in ways to make them last longer (example being adding a mix of gasses to help it not oxidize).

I prepare my own meal, and I don't need meat to be pre-sliced, but I do need it to be in a small enough portion that can be put into my fridge.