People have to work for a living, even though they say they will pay you i'm sure it's not enough to support there family on. Some people are single parents and can't take all that time to volunteer or, if they had to be sent to another country would not be able to go. Thats why people volunteer to do service because they have the time and means to do it. People with families or a life to support can not take a year to volunteer with little pay or if they have to travel away from there