And let's face it--the majority of the world's unreached peoples live in what are called "Creative Access Nations" (CANs). CANs aren't going to have many visas available for people who want to be public missionaries, and the opportunities that are available for living and working there will likely be out of reach for people who have only theological education. So, BAM is one of the best ways to go.
But I've learned that BAM will also bring a number of allegations against you... Usually from people who are just making assumptions and don't really know what you're doing. If you are planning to do BAM, be prepared to be accused of...
- Being Greedy--not really in it for ministry, but you're in it for the money.
- Being Distracted--you can't possibly doing as much ministry as you would be doing if you were a "full-time" missionary without any business responsibilities.
- Being only about Presence Evangelism and not Proclomation (or about social justice and not evangelism)--your business helps people physically, but you aren't doing any gospel sharing.
BAM is not for everyone. It takes a team to work well. But if you decide to do BAM--don't be discouraged if you find that you're not the sexiest missionary on the block in the eyes of some.