(Though, I've got to say, your original design here, is far better than what they adjusted it to. They should have kept the background milky brown as you had it, it makes the design with the white tools and cup etc SOOOO pretty.)
Yeah, I guess it all comes down to cost. And probably an extra colour just bumps things up WAY higher than what they want.
And the final thing does look really lovely. I really love it! (I think just seeing how great the original was spoils you a tiny bit for the final version. Since your draft was SOOOOOOOOOOOOOOOOOOO nice.)