The problem is – it's free
Barriers to Web Evangelism
One 'problem' with the Internet: it is free! How does this impact Web evangelism?
There are many ministries which produce evangelistic materials for others to use – literature, videos, etc. Often these things are sold (or offered on a donation basis) so that although they may be free to non-Christian end-users, they are paid for by churches, ministries and individual Christians. This funds the production costs of the materials, new product development and often also pays the support of the staff producing them.
However, in online evangelism, there is no 'product' to sell. Neither is it usually appropriate for evangelistic websites to attempt to sell things (with the possible exception of appropriate evangelistic books), so there is little opportunity to recoup costs this way.