You forgot your Foot Note. But your right Practice will answer 99.99% percent of problems, the other 0.01% of problems are from decks of cards "Spontanously Combusting".
JDEN
The point is to get a bulk pack of matches at a cheap price.
You can do lots of tricks with matchbooks, lots of old magic books have tricks with matchbooks.
Why would it be Dangerous?
Also can you post a link?
JDEN