We wanted a lower cost of entry into the game, and wanted to provide the best value possible.
Except that much of it has no value to me ... I'll probably never buy it, even to get cards for Arena that are not available any other way. (I am actually somewhat offended that I would have to buy extra content for another version of the game that I don't want to get them.)
I don't want to derail this conversation too much.
That said, all of the cards work in Arena. If you don't want to pick it up that's fine, but this isn't like Domination where the cards are only part of the product, and there is a lot to pick up there. In this product it's all cards. Now, as I said, if they're not cards you want that's cool, then it's just like any other expansion. Pick up the ones you need.
Now, all of this to say, we tried to give the most product (value) for the price, and I think we did. But, I respect your opinion DaveW, and I'm sorry you were offended.