Tiny Milk or Large Soda

I might be the only person who wonders about these things. Any thoughts as to why I can order a large soda (pop) at Subway but all the milk containers are tiny. Are the margins just not good on a milk sale? The company up sells chips, cookies and a soda but they are famous for those ads talking about how healthy the food is.

Milk is popular in Canada when you order a submarine sandwich but not so much in the US.

My favorite being Mr. Sub or some of those small town shops. Subway does not even make it to my list unless I am desperate and have been traveling a lot.

While I am talking about Subway and subs in general, can someone find a way to improve the quality of the bread please.