Hm... just a thought:
I'm wondering if BB tends to "honour" the orders that go through since the warehouses and their HQ are probably very separated from each other. For example, I actually got an order for the 13 month keychain submitted and the only thing that was mailed was the keychain... in a very large box. So orders where you just get the one bonus item are not necessarily old.
So I'm wondering if BB "has" to honour those because it literally would be too much effort to screen the orders at the warehouse. Probably as soon as the order is put in, it's generated in the warehouse as a slip and then someone packs it. Also, the total cost of the order is rarely shown on the packing slip, so the packers wouldn't know the difference. I would be surprised if this was the case. I'm thinking that's possibly the difference between Zoya and BB -- BB has its own warehouse, but Zoya seems to be packing where they are.
I'm also wondering if they'll possibly flag your account even if they do honour the purchases... regardless of whether or not you're satisfied, they are losing money here. I'm sure nothing's being done about it now since I've never heard of BB cancelling orders, but I'm sure if it gets too bad in terms of abuse, they might do something in the future... food for thought.
btw I say this as someone who's definitely taken advantage of the system so more power to everyone here. XD Just putting the thought out there since we frequently seem to have the "will my order be honoured" conversation