I agree. At the moment the cool down for them is just too high to bother with - although on the other hand I think the reason they set it that way is because of concerns if players could reuse them quickly it could potentially lead to players buying up huge stocks of them and thus causing problems in the economy (and the flowon effect of ALCs' causing a run on materials needed to craft them, thus compounding the problem).

Yoshi and the development team probably spent time debating possible cool down timers for it and eventually settled on the current cooldown as a compromise. But I still think it's a little too high. Reducing it a bit would make them far more useful than they currently are.