Yes, some missionaries have changed their tactics. But Jehovah’s Witnesses still heed the Founder of Christianity , Jesus Christ, who did not wait for people to come to him and who commanded: “Go therefore and make disciples. ”—Matt. 28:19.
Yes, Jesus did command his followers to "Go therefore and make disciples". But notice that he did not say, "Go therefore and sell magazines and books!"
Even if every Jehovahs Witness gave away every piece of literature, headquarters still makes billions because every Jehovahs Witness must donate (pay) for all literature that they obtain. And the Society makes it painfully clear by planting the notion in their mind at the Service meetings that the rule of thumb is to see what a book (or magazine) of similar size goes for at your local bookstore (Borders, Barnes & Noble, etc).
It costs them pennies to produce this literature and they place (sell) it for dollars!!
And what happens to the literature that the JW obtain (buy) but aren't able to place (sell)? They take it back to the Kingdom Hall and get their money back, right? Ha, ha, ha, ha, RIGHT!!
On top of this, every JW pays for his own gasoline and transportation to go out and sell this stuff. Headquarters has no expense!! They don't pay their labor or anything!
And as for the JW's being volunteers, these people are told time and time again, if they don't go out and sell this stuff, they will be destroyed at Armegeddon! (I believe the word here is coercion).
Headquarters makes out like a bandit!! (Well, after all, that IS what they are!!)