Is three or four years old "practically new"?
There's such a wide range that there could be a variety of reasons. Didn't like headless, got a 5 and didn't get on with it, got a 6 and didn't get on with it, got a 4 and wanted a 5, didn't get on with multiscale, wanted multiscale, upgraded from 10 series to 15 series, gave up bass, needed to pay a bill. Ibanez might welcome your research on the subject.