User blog comment:Falgæa/Deflation!/@comment-4131177-20130202140627

Cooldown Reduction in itself is not really usefull to all champions.

You have to keep in mind 2 things.

1st, if you have a resource limitation (e.g. Mana), you also need to have enough of the resource. If not, your CDR is worth nothing.

2nd, CDR offers you an option, not a straight forward output effect. It makes your spell available sooner, but which spells do you really spam? If you permanently cast spells when they are off cooldown, then CDR is worth it. Do you do? i rarely do except when i am in the jungle, and only on a few champs it makes sense to do that. On many champs, i can not really make the cooldown reduction be worth spending any money.

Also, the items on which CDR is more expensive aim more towards AD casters. Supports/tanks get their whole usefullness out of Cooldown Reduction, so in my opinion it is only fair that the stat is easily available to them. But go buy Fiendish codex on an AD caster. Yea, cheap CDR, but the other stats suck.

CDR is one of the stats that you really shouldn't value with gold, as it is much too specific.