There is a good reason why these are nearly always fairly cheap products.
They are produced en-masse and distributed to bars/ pubs/ hotels etc for free to advertise their products. Further the shelf live for the use of these jugs is very short. They will get broken in a bar environment no matter how good they are but they also have a short life span even if the surrvive intact due to the next new batch of jugs arriving to take their place.
The tat they sell in the distillery shop is generally the same as the promotional stuff and only makes up a small fraction of what is given out free.
Therefore they make sure they produce the cheapest product possible.
Of course you will get the really good ones in the shops at times but I do not think they are worth the money. A jug is a jug so go down to your local homestore and buy a proper one for half the price