These aren't exactly big secrets. Anyone can get copies of The Linking Ring, the magazine of the International Brotherhood of Magicians, and see ads for many of the tricks that require special props. (There used to be a competing publication, the "Magic-Gram", but it may be defunct.)

Realistically, if there's a video of a trick, you can usually figure it out. If there are multiple videos from different angles, it's easier. For that matter, there are explanatory videos for most of the big tricks on YouTube now.

I once saw a professional magician having a miserable time performing on the stage on the Santa Cruz beach. He was doing a levitation, and in brilliant sunlight it was embarrassingly obvious how it worked.