The answer to this should be "no", because (as you stated) you saw it "work" with your own eyes, and it only "works once".
No, I didn't, thanks for asking. Perhaps you should ask the OP of this "riddle" to phrase his question better - because I answered his question as it was posed.
I said it would only work for YOU once. You have seen it work for it's previous owner once. You just had a major opportunity loss.
This is absurd. If I can merely sit back and "watch the thing work for somebody else", why would I even waste my one shot? Why not just parade individual after individual in, tell them to trade off this magic crystal ball, then structure an agreement where I take half the profits? Or is that "working for me", if only indirectly? "Oh, but it has to WORK for you!" Uh, when I see a trade working, the "convince me part" counts as "working". Otherwise, what you're saying is that it will work TWICE for me - once to convince me, the second time to make profits. It's like the question, "If you had one wish, what would you wish for?" Well, it surely wouldn't be for a magical e-mini trade, it would be for UNLIMITED wishes. I revert to my original statement: Have the OP phrase a better riddle. PS This is getting way off topic. I've followed this thread from the beginning and only now decided to comment, because the riddle was so vaguely pointless. I defer to the main posters here and their original intentions with the thread.
Guys, you are starting to act like the people in the casino yesterday! Cool it - I see that someone made a bit of money with ANF today.