Actually, fortune can be used for getting flint out of gravel and clay.
But with Infinity on a bow flint is useless, and that is one of the first things I get before I start my regular gameplay; I didn't even make any arrows when I started my current world, only using one flint to make a flint and steel, and only one ever needed. It is also a problem (especially Fortune III, 100% flint drop rate), if you want to mine gravel for gravel.
As for myself, any enchantment that I don't want is bad, and this happens a lot because I enchant books so I can choose just what enchantments I use, which is particularly important when you use mod items that are very difficult to obtain; if you think diamond is rare, I've mined over a dozen times more diamond ore than amethyst ore, they also have the same very low enchantability as a book, and putting on more than two enchantments makes them too expensive to repair (and only one unit at a time at that).
(this is also why the repair changes in 1.8 are game-breaking to me, currently I can just rename my stuff and repair them forever at a high - but fixed - cost, very manageable, but renaming no longer fixes the cost so I'd have to enchant new items. Of course, I don't have to play in 1.8 and actually still play in 1.6.2, never even bothered with 1.6.4)
BTW, Fortune does NOT work on clay, which always drops 4 pieces of clay no matter what, similar to how glowstone never drops more then 4 dust (Fortune does affect the latter, averaging closer to 4, but Silk Touch is preferable as you get a 1:1 ratio if you are mining glowstone for glowstone blocks and not dust; that said, a Fortune (or Silk Touch) shovel works on glowstone as it doesn't have a specific tool).
I was trying to get my main sword, the one I would use forever after finishing off my diamond set. I had acquired a little over 90 XP levels to help in this pursuit. What did I get on it?
Bane of Arthropods IV. All three times.
I used LAN to switch into creative where rage drove me to keep enchanting new diamond swords until I got an acceptable enchant.
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My avatar-Madison Gotha. She knows various weapons, she's a mage/sage, and is somewhat immortal. Madison has the capability of taming and communicating monsters, a genetic trait passed down by her father. 26 physically, 1400-something mentally, and a Lofty Peakian/Zenithian mix. Doesn't really like being called an elf and hates being called human..
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Pretty sure I got Fortune II on a pickaxe once or twice. I know a while back I got a really crap run of enchantments, now whenever I do a 30 lev enchantment, I copy my game save 3 times and load each one in turn and do the enchantment, then continue with the one that gives the the best enchantment. Cheating I know, but in my mind balances things out a bit for me; I don't always get a great enchantment out of the three anyway, but usually one of them is better and more usable than the other two ....
Revolutionaries wait, for my head on a silver plate. Just a puppet on lonely string, oh, who would ever want to be king?
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