When you enchant an item (in my case level 30 enchantment) it only takes out 3 lvls out of your xp. Tested in 14w07a snapshot multiplayer survival.
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Thank you fienxjox.
The same update changes the XP curve, such that repeatedly making max-level enchantments at level 30 requires 268 XP (to return from level 27 to level 30) instead of the current 825 XP (to return from level 0 to level 30).
I hope this change will be undone since its unbalanced. Maybe to return 15 or even 10 levels of xp.
There is continued re-balancing going on - since it only takes 3 levels to enchant, they made the levels harder. I'm sure there are still a number of patches before 1.8, there may (or may not...) be further adjustments. You can look on the Minecraft Suggestions Reddit and leave feedback there (or join an existing thread on it which I'm sure exists). http://www.reddit.com/r/MinecraftSuggestions
Works as intended for the 1.8 enchanting overhaul. I would suggest reading the wiki for more details on the new (still in-progress) design.