Players often like to thieve bottles from the stall, then either wait a while or trade with a friend to sell them back to the stall. Because they are worth so much from the store, this allows players to get a decent amount of money using this method.
Some players also use the stolen bottles of wine (and jugs of wine) as means of healing when pickpocketing Master Farmers or stealing from the various stalls in the market. Because bottles of wine heal a good amount of hitpoints, this method allows for an easy-to-use, practically unlimited supply of food.
Some players training Ranged may take bottles of wine as food as it doesn't affect their training rate and offers a cheap alternative to many other food items.