2. More RMAH transactions = more cheddah for Blizz.
3. How to make runestones rare while making more transactions?
Solution: Never have a whole runestone drop, have Runeshards drop. either in halves or thirds.
Use Mystic to combine Runeshards for you like the Jeweler does with jewels.
Two ways to handle colors/unattuned:
1. Have colored shards drop. combin 2 or 3 shards of same color at mystic to get Runestone
2. Have unattuned shards drop, then combine 2 or 3 unattuned shards with a certain color gem or item to create desired colored Runestone.
Why YES Blizzard, I AM looking for a job, now that you mention it.