I used not to drink for years, primarily for cow growth hormone and some other stuff found on the wiki article. Being a typical asian male, my body is not so lactose tolerant - I remember getting frequent big-D's back in high school when I drank that stuff religeously.
Recently though, I realized I still consume plenty dairy products in the form of cheese. Looking for ways to further minimize grocery bills, skim milk replaced soy milks I had been used to for years.
It is my understanding that soy milk is overall a better product in terms of nutrition, and personally I much prefer its taste as well; milk has a distinct smell that I dont particularly care for. Then again, I am very forgiving when it comes to choosing what to eat, as long as its relatively healthy, cheap and easy to cook/handle. Soy milk is just too damn expensive as it only caters a niche market. If they were priced similar then soy milk for me for sure. I dirnk milk just because it is believed to be nutritious and is cheap.