Some of us are too quick to judge others and even quicker to provide responses w/out giving a proper thought. As it is required in the US, visitors on a visit/tourist visa must have a round trip ticket while entering the country, Nepalibhai might have simply been inquiring if visitors (citizens of other countries) need to have a round trip ticket to visit Nepal in order to facilitate the visa process - that's it! 

As simple as that - no need to be hyper folks!