The web is a great thing:
http://www.nfpa.org/safety-information/for-consumers/causes/cooking
Cooking fires by the numbers
Based on 2007-2011 annual averages:
Unattended cooking was by far the leading contributing factor in these fires.
Two-thirds (67%) of home cooking fires started with the ignition of food or other cooking materials.
Clothing was the item first ignited in less than 1% of these fires, but these incidents accounted for 15% of the cooking fire deaths.
Ranges accounted for the largest share (57%) of home cooking fire incidents. Ovens accounted for 16%.
More than half (55%) of reported non-fatal home cooking fire injuries occurred when the victims tried to fight the fire themselves.
Frying poses the greatest risk of fire.
Thanksgiving is the peak day for home cooking fires.
Couldn't find any stats at all on just crockpots in searches. Seems the biggest hazard is leaving something flammable near it but it rarely causes fires because it's not hot enough, certainly no hotter than a curling iron or clothes iron. And I'd like to see them try to ban those devices from hotels.
I did find this on the crock pot safety site:
"Just to be double sure, we got a very official all-clear from Lt. Anthony Mancuso, New York’s director of fire safety education. “There’s no problem with those items,” he says. “The main thing is, it should be a UL [Underwriters Laboratories]-approved product. Sometimes it’s a label, or it could be printed into the base.”
http://nypost.com/2009/02/04/crock-pot-safety-tips/
To be clear, HRA hasn't banned them. That happened in NYC at a different resort in a different chain. And even if they are safe, I personally ain't lugging a crock pot around.