Jesus' command only applies to evangelism.

If Jesus' command only applies to evangelism, then it would be ok to charge for the following:

• Baptism
• Communion
• Entry to church
• Prayer
• etc.

Jesus also did not have just evangelism in mind. The second half of this article covers this objection in depth:

The scope of Jesus' command

Interpreting it too broadly or too narrowly misunderstands Jesus' expectation for ministry.