It varies person to person and depending their situation and personal choices, even willing to marry a Nepali you may have max-out. Lets say, you have been to usa for a long time and out of status. Someone has to do you a favor to get married with Nepali girl. Why should she / he marry with you?
I guess girl has more choices than men do because of the ratio. Most girls have in some kind of relationship before they come to USA, so you must be in similar situation.