
I have to agree with Peter on this... I have props out there I can't even afford to own myself that I've helped design and as a certain Mr. Stinemeyer points out,
"There's a reason why I keep my day job..."
There are those in this very forum that would lead you to believe that they have made tens of thousands of dollars on their eBooks and yet, NO ONE in the pro world has heard of them and if so, it is typically the result of said "authors" or "innovators" sending them copies of said products, fishing for an endorsement... interestingly, very, very, very few ever get any kind of kudo in that what they are trying to pawn off ISN'T original, Hasn't been completely thought through, is overly complicated/illogical and a myriad of other things.
Creating an effect that will make someone significant sums of cash, especially in the short run, is amazingly rare. Part of it depends on marketing (such as we just saw with TARANTULA) and the other side of it centers on whose attention it grabs at which convention and the kind of stir it makes during that particular 48-72 hour period and if or not that energy carries over to the commercial venue... when major dealers start offering it, etc.
As a designer of magic both large and small, I can assure anyone that may want to ask, development and sale of magic IS NOT the way to go if you want to have an easy way of generating income. When I was still collecting Royalties on
Shadow Vision I saw $500.00 on every $15,000.00 prop sold... to my knowledge, less than two-dozen legal versions of the effect were ever built by Ken & the crew e.g. I've seen a personal gross gain of roughly $10,000.00 for six months of intense work developing the thing and of course, that all came over a two + period of time... so, where's the money?
Realistically all the tricks and eBooks that go out there are but ways to SUPPLEMENT you income and get your name recognized within the rank & file of the magic world. You'd be shocked as to the plethora of folks out there that are significantly more creative than 95% of those you read about and see selling this or that, but these are WORKING pros that are simply too busy to be bothered by the ego tripping, which is what most of what we see, is really all about.

I'm just waiting for someone to come out with video on new products that actually show the product and what it does vs. some kind of MTv home studio production with crappy music, jerky footage and next to NOTHING that would make the over 40 crowd want to fork out serious cash... and that is who tends to have the extra bucks to blow.
Anywho... it's late and I'm just rambling... ptoooy