This organization villifies anything from the religous, political, or business sectors of society. They claim they are directed by God, guided by Holy Spirit, and are motivated by Christian love. Worldly "Big Business" is supposed to be greedy, corrupt, and immoral (Satan's world remember?).
In the "real world" there is nothing wrong with it, BUT, and it's a big BUT, in their world it is supposed to be beneath them. They claim divine blessing.
Angels are supposed to be directing people to the "truth". They are not supposed to have to use worldly advertising techniques.
Now getting people to create some web designs is not as much the issue as using a PR firm to help mold their image or guide them through such things as spinning this 2014 embarrassment.
Sorry, I still don't see what the big issue is. They buy toilet paper for Bethel bathrooms that is made by "worldly" companies. They buy all kinds of goods and services from "the world." It's just business. You say that "they are not supposed to have to use worldly advertising techniques," but where does the WTS ever say anything like that, or imply that such a thing is beneath them? You are imputing arguments to them and then knocking down the arguments they never made; that's a straw-man fallacy. Remember the famous cry, "Advertise, advertise, advertise the King and his Kingdom?" I don't recall the Judge adding afterward, "but don't use any worldly advertising techniques." I think you are creating a tempest in a teapot here out of nothing.