Milky Pens were the symbol of wealth and class when it came to pens. Bic pens only cost a couple of cents, or you could just steal them from the bank. Milky Pens were like four bucks a pen. That's an insane amount for a pen, especially back in the 90s. It was only the rich kids who usually had these. It was too difficult to convince poor parents that four dollars a pen was a good deal. Especially when one day those kids will grow up and have to use blue or black pink.
Milky Pens definitely wrote very well. You don't pay that much for a pen without getting one hell of a pen. True to the name, they were very milky and great for love letters. You couldn't really write a love letter without one. Even the crappiest love letter could be made better by using milky pens.