So, I’ve got a simple concept that I think would go really far in this game. Runes and Sigils below exotic tier are, similar to how blues and greens where prior to this recent patch, absolutely useless. They exist as cheap passes for those who cant afford exotic tier, and a few extra bits of damage for leveling alts, but after that point they become nothing more then NPC fodder. On top of that; with the recent salvaging increase brought about by the implement of the luck mechanic even the few that where worth a few silver in the trading post have dropped substantially.
So, my suggestion is simple. Do with them as has been done with Greens and Blues. Let us salvage them, but for the teeth and fangs and leather that went into creating them. Make them a little more worthwhile to have around.