One of the best sleight-of-hand guys I know is a plumber.
Not only do I lie, I take real pleasure in lying, in the transmission of magic effects.
That's one of the ways language evolved, by some very obscure form becoming common usage. And I must say that I'm very intrigued by use of language and slang, and criminal underground terms.
For the most part, magic secrets are available on a level that's overwhelming and frightening, and they are very accessible if you do the tiniest bit of digging. But, that said, there's a certain group of individuals, in which I am included, who are very tight about secrets and don't share them with anyone.