Historical reasons. Movies were originally at 16 fps, but 24 fps is more lifelike. It also gives better audio from the soundtrack. But 24 fps uses up film 33% faster, so it's far more expensive. Bumping that up to 60 fps would mean that film costs would rise nearly four-fold over 16 fps.<p>Film is not cheap.<p>Nowadays, flash memory is cheap. But I can remember buying a 250 MB (that's Megabytes not Gigabytes) flash card around 2001 that cost well over $300. We had the same cost/per video minute pressures there too.