I asked my guide about getting a BWV litho if I added on and she told me goodies are only sent out if purchasing 150 points, which is basically buying a whole new contract. If you were to buy into BCV you'd have to purchase 150 points minimum, which automatically gets you the lithograph and the tote/backpack, and adding on 150 points is treated the same way. Adding on less than 150 points will not automatically get you goodies. However, it seems that some guides go out of their way (and maybe bend the rules a little) to make their clients happy so they send them the goodies, be it a litho, backpack, pin, hat, whatever. This is good PR on their part, but then it looks bad for the other guides who don't give away freebies freely. Also, I think the the situation gets worse when people post on the boards about what they received from their guides, because someone else may not have received any goodies at all.
P.S. They're out of BWV lithographs right now; that's probably why akghutton received a BCV litho even though he/she added on at BWV.