I definitely agree with that rule, but for $50 or less, why not? If it turns out to be fake, then you have a good study piece to compare others with! And if it is real, you've just made a splendid purchase! As for buying at auctions, I trust the experts enough that they will be able to at least get a fairly good idea of the authenticity of an item. And most also come with some sort of provenance. Besides, they're absolutely beautiful. But yes, I don't recommend buying expensive jade if you can't touch and see the piece in question- and I have yet to do so.