Originally Posted by Wakadaka
My guess is that they are trying to do some old school design and say that you can't bring the bottle back and expect them to fill it up with beer.
From what I have read most bottles will work fine if they originally had a carbonated beverage inside of them.
Could be the brewery builds the cost of each new bottle into the price and uses only new bottles on the line. Saves a lot of added work as far as returns, storage, handling, cleaning and sanitizing. New bottles are cheaper in many cases than having them returned from great distances.