Wow, that's gotta be discouraging... especially the part about it being his best instrument and not wanting to give it to you. Sounds like it could be a really good fortune if you do get it somehow.
I wonder - how many violinists are in the market each year for a top notch violin the way you are? I'm starting to think that there is a real shortage of skilled violin makers. Or maybe there are many makers that are "close" to that quality, but you are looking for the best of the best? Still, that's tough whenever the supply is so short.
Maybe you should see if Yvan can make you one!