This is such a contrast to the churches that I have attended where the pastors actually encourage you to study biblical Greek & Hebrew. The languages that the bible was written in are so much more descriptive than the English language so a bible scholar (or really any Christian) is really missing out by not studying those languages. I took a class in biblical Hebrew and I found it to be absolutely fascinating and it really enhanced my understanding of certain scriptures.
I think the WT discourages JWs from studying those languages because anyone with a true understanding of biblical Greek & Hebrew would see right through the NWTs inferior & misleading translation. I challenged my mother once about why JWs don't study those languages and she actually said "we don't need to because those guys at Bethel are pretty smart and they translate the scriptures better than we could."