because it tastes like sunshine in a bottle
I think it's more of a scientifically thing that's wired in our body. The coldness of the drink triggers somethings and causes us to crave more. Your taster buds are also dulled when the drink or food is colder than room temperature.
I think it's because you don't get the full citric acid burn from ice cold OJ.
I know the feeling ! It's so 'more-ish'