Matt Colvin blogs on the subject of missionary support:
One of the goals of giving a handout to a bum is to avoid entering into any deeper relationship with the beggar: toss him some money and walk on. By contrast, if you are supporting a missionary, you should see it as something that binds you together with other members of the body of Christ. You as a donor should ask, “Do I want to partner with this missionary? Is he the sort of person whom I want to represent me to the Philippines (or France or Haiti or India or…)? Will we, together, be doing the Lord’s work?” And if the answer is, “Yes,” then neither he who asks nor he who gives has any need to be embarrassed. The Lord loveth a cheerful giver, and a donors who are in a sending relationship with a missionary delight to hear when there is “an opportunity”.
Matt, his wife, and family are preparing to go as missionaries to the Philippines. If you would like to know more about their support situation, read this.