I guess we could track down the programmers and just ask them what the probabilities are.

They might even answer. (Has anyone tried?)
30191 makes a good point, though: We're already spending our free time playing a flash game where we make a snowman run around bombing fruit. It can't really get much more frivolous than that.

Personally, I've found that this experiment adds some extra interest. Even if it's a waste of time, we're not forcing anyone to participate, and it isn't like the thread is off-topic/disruptive/full of spoilers or anything.

It's up to you whether to let it continue, of course, but I think it's safe to say that we'll quit on our own sooner or later.
@Nemo: If you want to make a page like that, that would be neat! Don't feel obligated if you're having second thoughts about keeping this up, though. ^^;
I was also thinking of removing all the individual zodiac potions and constellations from the list, in favor of having one item at the bottom -- "Zodiac Sign (any)" -- which could apply to any of them, since they're all coefficient 3. It would shorten things up a bit.