A book that came out this spring called
The Fruit Hunters helped fuel the craze this spring.
See
FlavorTripping with Miracle Fruit - San Francisco, Aug 4th 2008 « Flavor Tripping
http://www.nytimes.com/2008/05/28/dining/28flavor.html
Plants that are 3' tall that would sell for $65 a year ago went for over $200 this year and I'm one of those who was crazy enough to buy one, figuring that there wouldn't be large ones like that available again for a few years.