Its just some people's preference. I like yellow and red cur gyps,,, they are not any better or worse than any thing else out there. It may not be about cost of food. For some people an extra cup a day is a small price for having what they like.
Look how many people drive diesels and jacked up trucks that don't need them... its just what they like.

If it is all about the cost of food... then I guess you would be right nosightsneeded.