Because a "camp bed" is still a bed. And because sleep is essential, irrespective of the circumstances
Although a sleeping bag is still the must-have camping accessory, when used alone it doesn't always guarantee a restful night's sleep after a day of hiking or long walks on the beach. Not to mention games of boules and Finnish skittles etc.
Furthermore, although it's light which means you can escape to the countryside with just the bare minimum of equipment, a sleeping bag will not protect you from the discomfort of uneven terrain. Or protect you from the tiny pebbles you failed to spot when you were pitching your tent but which are now digging into your back and feel like they're 10 cm wide; nor will your sleeping bag insulate you from the ground on cold nights.
So this is when the camp bed comes to your rescue!
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