I don't think the 1858's (as well as the 1859/8 and 1859 N9's) are being hoarded anymore. Now they are being collected by die pairs thanks to the catalogs Bosox published as well as Haxby's 1859 N9 catalog.
I think we are seeing with Canadian Provincial large cent collecting a parallel to what has been going on in the US early large cent collecting for about 100 years. As the die pair collector base grows, demand will grow, supply will shrink and prices will increase. I think we're already seeing this. It takes about 340 die pairs in a collection to get all of the currently known provincial cent die pairs and that number will grow as new die pairs are discovered.
In my opinion, it's a great time to get into collecting these while they're still available.
Well said, Phil. I have given some of my vanilla '59's to a friend to sell, but with the Haxby numbers included. They are ones where I have more than 4-5 of that die pair. They are selling wonderfully through his collectors.