It's about time.
Even when I was a true believer, this always just looked bad.
It seemed like pointless paper-shuffling. It would be kind of like the Dept. of Motor Vehicles charging State agencies a vehicle registration fee. At least in California (as screwed up as we are on so many other things) they don't do this.
If you can stand to put on your true-believer goggles for just a minute, it ultimately made sense either way, (we all want to give as much as we can to further Kindom Interests 
), but the interest charging was a dumb idea from day one.
OK, now take off those goggles, and get real. The WT most likely squeezed out quite a few extra drachmas over the years that they wouldn't have gotten otherwise.
om