Buying Lithium Bateries

[Polecat]

Guys check this out on RCCanada   Buying Lithium Batteries. Not good news for us electric guys!!!

[thehaze]

http://www.rccanada.ca/rccforum/showthread.php?t=298121
Here is a link to the post.
Hard to say what this means. We all know that LiPo's need to be handled properly, but in mind it's not like these things are blowing up all over the place. In the article the test involves them inserting a cartridge heater to effectively start a fire. Is this a likely real world scenario? Do batteries in their boxes routinely start to overheat and ignite?