Why yes there is an ethical line and it's even stated plainly at the IBM and SAM sites regarding the ethics of magic.
http://indianmagician.blogspot.com/2004 ... thics.html
from the SAM site:
7. We are opposed to the exposure of magic whether by purposeful acts or through careless or ill-prepared performance.
8. We are opposed to the piracy of magical creations.
Now as to whether the venal concerns of some on our little world make their sociopathic behavior somehow acceptable... that's a separate matter.
Your choices are your own. Why is anyone asking folks here to condone what has already been clearly stated from the start as exposure?
However, the larger book market and the larger market in general is not part of the market in magicdom there is really no need to fuss over "magician's rules" and so you are free to do as you please - as mentioned in an earlier post.
It is my considered opinion that the dual valued market in magic does not serve either the casual reader or the serious student and so your planned actions are ultimately in our best interests to make the "how to" of magic less generally accessible. Again - IMHO.