As an aside, when and why did lobster become a luxury food? I read once that lobster and shellfish were previously considered peasant foods, and only something to eat when on the brink of starvation.Don't be obtuse. Surely you have been to red lobster and seen the price of lobster tail. In this day and age it would make more sense to require the abstinence to be expensive food/delicacies instead of no meat. No meat was originally established because meat was more expensive than fish/seafood. That is no longer the case.
(Perhaps that's why shellfish is allowed?)
Are you sure about that?
I've read the avoidance of meat, as well as other animal products (dairy and eggs), is to remove and remind us of the animal nature of our fallen conditions. We abstain from animals in order to focus on our spirit. Also, abstaining from wine*, a luxury/pleasure to the mind, and oil (fried or craftily prepared food) help remind us that God, not earthly pleasures, is our goal and purpose.
Better than some marketing conspiracy, anyways.