I can understand people who are mining being frustrated that they get pebbles and they don't seem to sell at AH, but i might suggest, offer them to a monk.
My boyfriend has been sending me the stacks he's accumulated when mining. Trust me, they are wonderful for pulling a monster for you. I hit 1/2 the time and even with no damage, it does pull. I can't thank him enough because at Windhurst they are 500gil a stack!!!
For us poor monks with no range attack (well until Chi Blast, very high level) this is our only way to pull. If you can't see them, donate them to a monk friend. I'm happy to send a few crystals in exchange for 6 stacks of pebbles.