Well they do but they don’t.
There was a time when I took photos with a view to printing them but these days I nearly all my photographs are taken with a view to publishing them on the various Web sites I run. Sites like Hervey Bay Gossip and Aussie Motoring are packed with photos I take.
Because of the constraints of bandwidth and download time those photos are all published in file sizes of less than 60 or 70 kb and taken with a 4 megapixel camera. For ordinary Internet use and a 4 megapixel count and file sizes of the size I use are quite adequate even though there is some loss of detail.
But there is a demand for high-resolution photography where you can zoom in on a single feature and see every detail quite clearly. For that you need a pixel count in the billions and something like that doesn’t come from a camera.
Instead photos of that quality come from a computer running software that uses hundreds of photos stitched together with allowances made for a number of variables including things like the movement of the sun.
This northern summer Microsoft is aiming at producing a 10 gigapixel picture and you can read about it here