if I will invest 10.000 usd (just an hypothesis) and if one or two years later I will have 15.000/20.000 back I should be satisfied. but if I invest 500 or 1000 I expect an exponential growth.
Well dating websites are often used nowadays, but one of the most important things of this kind of web services is the protection and privacy level of personal data. If a project like this demonstrates that user data are jealously protected i think that we will assist to an exponential growth (sooner or later).
there are many things to consider for a successful dating site like:privacy,equal database(man/woman),geographic location(enough partners near sercher),same interests matching...
I am sure these elements have been well thought out and put in place for the project to make it worthwhile solid dating site.