I did not really undersand your comment. fylfot was spot on - I only have so much time and I have three major projects (ArtWorks 2, Gimp-Print and EasiWriter/TechWriter) already.
Besides, this is about selling someone else's software - the very last thing I want to do (no matter whether it is Vantage or any other piece of software). I am good at developing and supporting software. I would rather give the distribution hassle of all my own software away than take on some other software to sell.