Keep them off the market for now, if you look back at some old sales you see some really good tags going for a lot less than what a tag of the same caliber is going for now, so if the trend continues (which it will unless there is a large reset, which I doubt will happen) the prices will go up even more.
The less tags there are, the higher the price. The more tags there are, the lower the price. With that being said, as of right now prices are outrageous. If there is a reset/spaced tag glitch/swap method/unban method, prices would be lower. Hope I helped.