Jeez, you're everywhere. In fact, I've seen a lot of people from the AF in here... what's the deal with that? And I like your suggestion and I figure if I repeat it they'll be more likely to actually do it.
Anything that is used as an ingredient in alchemy should be able to be bought from shops, found reliably in gift boxes or DC, or made with alchemy. We can't just go running out of things!
Limited-edition formulas would be understandable, I suppose, but not ingredients because then you might end up with being short by just 1 item and that would be frustrating.
Another thing I thought of besides just the knock-off items idea earlier:
Musical instruments. You've given us Faunzy's Flute and Enchanted Strings, but not much else (if I'm wrong, someone please point me in the direction of a good flute)
And electronics (though I suppose it would be odd to do that with alchemy). Microphones, MP3 players, cellphones, laptops, even a TV remote! A game controller? Something!
I like what Kaze Espada wrote. Just like how you can take guppies and turn those into bass and turn those into... uhh... I forget what comes after that, but you know! Kaze said it already, so just go look at that post instead.
In any case, I really want a use for all the junk I get from the daily chance.
I also agree with myruna-chan. Give some rewards to the people who play Monster Galaxy. Stuff like special formulas and reagents!
edit// OH, OH! FOOD! Let us make cool food items with this! Alchemy is like magic science, and cooking is science for hungry people, so alchemy can be like cooking if you just belieeeeeeve and wish upon a star and clack your heels three times.