friendship evangellism,love or manipulation?

For a long time i have been uneasy about so called " friendship evangelism"it reminds me so much of the wordly tactics,pretending to be your new best friend, but only because they want your money!( or pressure selling ) as it is called!! It is the prcatice of befriending some one with the sole purpose of bringing them to the Lord, which of course is a very wonderful thing to do, but as the Bible says, how can a bad root produce a good fruit.. Its a wordly practice, what amazes me is that the church believes the wordly people dont know excatly what they are doing, the wordly people are more "wordly wise" than we are, not surprisingly!!