To be honest, I can easily see this thread spiraling into something that'll get closed. In the meantime, I'll give my response.
Personally, I don't see anything wrong with selling a magic DVD over Ebay. It's no worse than selling any other DVD. I know some people are going to say "but, but, but...
the secret!!!", but that's like saying "but, but, but...the plot, especially if there are plot twists!" You watch a magic DVD to discover a method for a magic trick, and (hopefully) some tips for performing it well. You watch a regular movie to enjoy and discover the story. They are similar enough to me (some may disagree, and that's okay--I respect that not everyone will share my opinion).
Additionally, the person releasing the DVD doesn't get to make money off of the sale over Ebay. This is true of both regular movies and magic DVDs, so no difference there.
There was another point up there, about many getting to watch it without paying...I'm going to assume that's just for torrent sites, as Ebay is not a charity site, so everything on there must be paid for (and usually sells for cheaper than most other retailers). As well, "comes from a purchased dvd" I'm going to assume is also for torrents only, because the DVDs for sale on Ebay (assuming you aren't buying a ripped copy) don't just
come from "a purchased dvd", they
are purchased DVDs.
In addition, I can see Ebay being a valid option because what happens if you make a purchase that you're not happy with? If I were to purchase an effect I had no intention of performing, Ebay seems like a pretty good option to me (especially if the company/person didn't accept returns on opened goods, which is most often the case with DVDs). I mean, it ends up essentially being a washout, because you're not down any (or much) money for a wasted cause, and the artist still got paid with the original purchase.
With all that said, I've only made two purchases on Ebay (both for unopened copies of the floating rose, and business cardiograph), and I was (and still am) happy with both purchases. Why did I choose Ebay? Both the price of the DVD and the shipping was cheaper than any other online retailer could provide me (note that you have to keep in mind that a lot of the sales on Ebay are by retailers--often times magic shops will open up an Ebay store instead of a regular website because it's cheaper and easier for them to operate).
Also, of course, torrents aren't helping the magic community very much...sure, it helps get some people into magic for virtually no cost, but the magic community suffers as a whole (lower sales = low incentive for magicians to release good material (why would they if it's just going to get pirated anyway?) = a sad magic community).
In summary, I guess I'm saying that torrents are much worse than Ebay, seeing as I believe Ebay is a valid option in many cases (I realize not in every case, as there will be people who buy the DVD, rip it, then sell off the original DVD--but there's negatives to everything in life. Some people are good, some people are bad--should we wipe out all human beings just because some are bad? Goodness no, that's unfair to the good ones. Same applies here--there are enough good uses for selling magic on ebay that it outweighs the bad. Again, obviously it's my opinion, you don't have to share it, just respect it).