For the past 3 years or so over 50% of my images submitted to picture libraries have been multi image panoramic stitches.
For many libraries a file size of 48MB + is required. This is to give clients the opportunity to print up to A3. Since there are very few DSLR's that are capable of producing files of that size, files have to be interpolated.
This is something I've never been happy with. It does compromise on image quality and "cons" clients into thinking they are getting something they aren't.
However since its part of my living, I've had to do it.