Problems with S.T. Dupont (fancy pen) Roller Ball Refills?

I have a fancy S.T. Dupont pen that takes roller ball refills. I use it to take notes in meetings (I am an executive and probably take 3-4 pages of notes per day). I have gone through 3 refills since January 1st. That seems a lot more rapid than any pen refill I've ever used. And the refills are expensive, and hard to keep in supply. Has anyone had similar experience - - The vendor is The Ink Flow from San Antonio, TX.|||That is about how often I have to refill my wife's pen. Perhaps you wish to switch to a nice pen that uses less expensive refills.