Different journals have different policies and operate on different revenue models. Hence, they have different fee structures as well. For example, most subscription-based journals charge authors for printing color figures/artwork. However, they do not charge any fees for publishing a manuscript. On the other hand, many open access journals charge authors a fee for publishing their articles and they use these fees to maintain the journal.
As these fees differ from journal to journal and, more importantly, need to be paid by the authors themselves, they are not included in our Journal Submission fee.