Seeing as how prices are going, I'd say save it. Don't hold me on this, but from what we've seen, Key prices are going up. They went from 15 to 16, and now 17 ref since the start of the year.
In my opinion, it's time for a drop, but then again, we can't stop the inflation after Refs were pumped out all over the place. The more refined there is in the world, the more keys will cost.
My Prediction: Another 3 refined increase before it drops down to around 15ref.
Anyone remember when a key was 6.33?