Why can we not just buy shards from crafting vendors?

Shards are what feeds rmt they bot and sell the shards to the crafters as the primary source of money. If you do not think so check the listing for the shards same names I report underground mining selling thousands per day. After crafting to lvl 15 I noticed I was running low on shards attempted mining and wanted to fall of a building after 2 hours, what did 2 hours produce about 30 mins worth of crafting, not worth it. selling shards from vendors would increase the number of people who craft and those who like gathering mining without bots could still sell everything else.
so why not sell shards from vendors who would this hurt beyond the botters?