A $149.00 is a big difference - something's not right. I agree with your spotting the magnification difference, but 2.5x-10x to 3x-9x is not a big deal, and I really don't think that rainguard, just itself, is a $150 product. Look at the Elite 3200s - they have rainguard and a 3x-9x-40mm Elite 3200 (which has rainguard) costs about $180 or so, so the scope, without rainguard, can't cost only $40.
There has to be something different about the Browning scopes, and you said something that makes sense. Given that you said that the Browning scopes are comparable to the VX-IIs and Buckmasters, and that the Elite 3200 is comparable to those, then I honestly think that the Browning scopes, contrary to what has been said, actually have 3200 glass - and without the rainguard.
Zachary