Why have I been asked to pay to publish my article?
Article Processing Charges (APCs) are charged to authors of scholarly articles during the publication process. APCs are used by open access journals in lieu of subscription fees that libraries and readers traditionally have paid to gain access to research articles. APCs shift the burden of journal production costs (editing, peer review, hosting, archiving, preservation), to authors from readers. Paying an APC results in an article that is available to anyone with an internet connection. Corporate, non-profit, society, academic, and other publishers use a variety of models to meet their income needs and publishing service costs, and charging APCs is one model.
APCs should not be confused with page charges long associated with both print and digital publications. Page charges are used to cover administrative costs as well as the cost of print publication, but do not make the article available in an open access (OA) model.
Journal APCs vary greatly. Many OA journals are free to publish in and at the higher end of the spectrum APCs can be around $3000. Be sure and look at "information for authors" or similar to find a journal's fee structure.
Is it worth it?
In addition to the above reasons you may consider paying an APC, Eigenfactor.org, from the University of Washington, provides a tool to help determine value among OA journals that charge APCs. Filter the data by discipline to see titles of interest to you.
There are many reasons why UNLV authors may choose to publish in a journal that charges APCs.
*Every author should read their contract with their publisher, ask questions, and suggest changes. A high quality journal will be very clear and open about their policies, including APCs - the cost, and any benefits that paying an APC gives authors.