In terms of quality, health, and safety? Is there a valid reason why seed mixes for caged birds are SO much more expensive than the same types of blends for wild birds? Or, is it just a rip off? And, is the only difference in the vitamin and mineral supplements added to the caged bird blends? Because those are easy and cheap to add to food yourself. Just wondering. I am going through a lot of expensive caged bird blends for my doves, and I am wondering if I am being wise to buy the more expensive stuff, or just getting ripped off and could be saving a lot of money by buying the wild bird blends for them.