I can answer your question kian, not to take it away from trod...
Fortune picks work on ores that drop an item, not the ore block itself.
For example,
In a world I have, I have a fortune pick which gets 1-5 coal every time i mine a coal ore block, however iron drops and ore BLOCK, so this does not work. I believe it also works on things like redstone, which drops multiple ore items, however i am not positive (If it does it makes it drop even more of the ore). On the plus side, I get 1-4 or -5 diamonds per ore block
And i would totally buy this but like you said trod, Everyone who wants it cant afford it