what's the worse that could happen if I DO market it?
You're looking at this from the wrong standpoint. Step outside of your ego, and don't take offense that I used that word, since we all have an ego when it comes to personal creations, and ask yourself where the benefit is for the move. What's the worst that could happen? The ghosts of Dai Vernon and Ed Marlo could haunt you forever for releasing something so small by itself into their fraternity. That's the worst I can think of. Further down the list would be the ostracizing you get from the rest of the community, the constant insults you have to deal with that will last forever in internet archives, and all your thoughts being discredited instantly if someone with a great reputation craps on it.
Young magicians, and I'm speaking solely by knowledge and experience, never realize the intolerance that others share for them. I've been learning and performing magic for 16 years. I've sold one thing that was my own and took it off the market two copies in.
I've seen how negative the magic community is overall. Unfortunately, most of the negativity is warranted now. In this age of information, it's too easy for someone to sell a magic trick without putting the time and effort into it. In this case, you've performed it for a few people and now want to make money off of it. In the old days, long before I was born, a magic trick was refined for years before a guy would be approached to market it. To top it off, those things that were going to be marketed weren't sold by themselves, they were included in books full of other tricks.
My advice would be that, if you really want this to be published for the good of the magic community, and not to make a couple of bucks, then submit it to Joshua Jay to include in Talk About Tricks in Magic Magazine. If it really is worthy of being published, which I can't say that it is or isn't without both a good performance and actually knowing how it works, he'll publish it, give you full credit, and treat it with the respect it deserves.
That being said, I'm a nobody. I've filmed a DVD project that I've scrapped and decided to start over, even though it was essentially finished. I've filmed videos with Jay Noblezada that we decided to scrap and reshoot. I've released nothing to the magic community by large, only to a few students here and there, and the only people that know who I am are the people here or the people that I've met at magic shops or gatherings over the last few years. You have no reason to listen to me or accept my advice, but you should know, I scrapped both of those projects because magic, to me, is about more than a couple of bucks. The work that I release to the magic world is my life's work. If it's not up to the standards of the guys like Vernon, Marlo, Elmsley, Ramsay, Wonder, and Burger, etc then I have no right to release it. Magic has taken so many steps backwards over the last few years that I don't want to detract from it myself. That turned out much longer than I'd expected it too. Hopefully someone gets something out of it.