I agree that JWs should make more use of the net - however TV ministry is very expensive & ineffective - many "Christian" groups are winding down this method as this quote indicates:
"A review of the history of religious uses of television suggests that religious television at present is at a crossroads in its development. The evangelical and fundamentalist strategy of building programming on direct audience support and purchasing air-time for religious programming for the purpose of evangelism has been shown to have not succeeded. The paid- time religious programs' audience sizes have levelled off with only a small minority of Americans viewing; their syndication patterns and audience characteristics indicate that they have not been effective in reaching to a great extent outsiders to the Christian faith nor in achieving their theological objectives; and they face mounting financial pressures with a possible decreasing base of support. "
Don't discount house-to-house & informal ministry , however. In UK , the door-to-door selling of electric & gas contracts is the most effective method of promotion:
http://www.nao.org.uk/publications/nao_reports/00-01/000185es.pdf