As publishers like Elsevier, Tylor and Francis, Springer, etc tend to extract a lot of money from authors, they asked reviewers to evaluate papers for no a single penny! Though referees put a great effort into reading critically the papers and writing comments based on which editor will decide to either accept or reject. Sometimes even the referees had to evaluate the manuscript twice if he/she recommended revsion. The question why not reviewers demand getting generously paid by these publishers for assessing manuscripts, these publishers experience no mercy in getting publication fees paid by authors.