Some have a broad membership base of diverse users looking for many different types of relationships.
It is possible that the mode of online dating resonates with some participants' conceptual orientation towards the process of finding a romantic partner.
That is, online dating sites use the conceptual framework of a "marketplace metaphor" to help people find potential matches, with layouts and functionalities that make it easy to quickly browse and select profiles in a manner similar to how one might browse an online store.
Members can constrain their interactions to the online space, or they can arrange a date to meet in person.
A great diversity of online dating services currently exists (see Comparison of online dating services).
This model also allows users to switch between free and paying status at will, with sites accepting a variety of online currencies and payment options.