It is pretty bad that you can get soulbind on aquire runes from the mystic forge, which is by its nature a random roll, which means it is fairly unlikely that whatever charachter is gambling will be able to use the rune. You end up getting what could be a valuable rune, but is essentially only worth npc cost.
I suggest you either make it account bound on aquire (so that at least you can stack them in inventory and give them to different charachters)
or make it bind on use/equip so that they can be sold/traded or given)
another possibility is to have some npc who collects them for higher profit.
this is mostly an issue with the superior runes, since you can at the very least place the others in the mystic forge.