Agree with all of the above - when we were looking, BLT's dues were significantly less than AKVs, it would have been a few hundred $ a year less in dues. Also, we just last week booked for about 5 months out a savanna room at Kidani when BLT was mostly booked already. TPV does tend to go pretty quickly at BLT, maybe not as fast as standard but it does help to have BLT points, especially if you are traveling at busy/popular times.
One thing to consider, however, is the size rooms you will generally be booking. BLT studios are notoriously small, and if you are considering BLT as a home resort, buy enough points to get into a 1br, at least once in a while, if there are more than 2 of you traveling. DH and I went on an adults only weekend and the BLT studio was perfectly fine, but it would have been tighter with the two kids, especially with a crib or stroller. We have stayed in the larger studios (VGF, RIV, BWV, BCV) and they were all fine for our family of 4.