Firstly, let me say that the possibility of these "exotics" being fake is, to me, totally irrelevant. I don't collect Christensens, or any other high-end marbles for that matter, so I have nothing at risk in a monetary sense.
The only reason for my posts is my attempt to overcome, in a very minor way, more dishonesty. As the prices of marbles have risen, it has attracted the inevitable con artist. How many Ebay listings are now nothing more than an attempt at misrepresentation? New marbles as vintage, damaged as mint, common as rare, contemp's as vintage, seeding a larger lot, making up dumb stories about provenance, and plenty of disclaimers, are just some of the ploys to get something for nothing. Unfortunately, this is common in all areas of society.
I may be in the minority on this, but it's taken some of the joy out of collecting. Instead of marveling at the beauty of an "Exotic", all I see is the scramble for maintaining and increasing price. For me, that is a major disappointment.