I: You are showing others how to do magic, teaching them, you are spreading the "sin" and will burn in hell twice for that!
A: (Romans 3:7-8): For if the truth of God has increased through my lie to His glory, why am I also still judged as a sinner? And why not say, “Let us do evil that good may come”?—as we are slanderously reported and as some affirm that we say. Their condemnation is just.
There is a huge difference between encouraging and educating them.
I don't need to exhort magic since magic will exist and keep spreading with me or without me. But it must be a point where someone tells the layman the truth, even more, when they ask for it. If I don't explain/expose the magic trick or illusion in a tutorial form, then the layman will still not understand what it really takes to accomplish it or to figure them out.
I am not encouraging the layman to behave as an egocentric magician (those who want to keep everything for themselves); quite contrary, I am encouraging others to know and spread that which is the truth, absolute truth; and for that, there are several amusing ways to do it.