There are so many problems with them right now; the locations of the dragons , how strong they are, and the drops you get considering the time it takes to kill them.
The wilderness right now is a joke filled with high level mages who just hunt pvmers and neitiznot is a members only area that doesn't get used because most members don't have to worry about making money from dragon bones.
I've actually killed frost dragons recently, I could kill 9 in one trip. I just had a black dragon task and I killed 45 without banking (black dragons have better drops), with the exact same gear and inventory. Why is a level 166 that is only located in the wild for non-members so strong?
They are also horrible for making money; if I wanted to make money, I could collect an entire inventory of dragon bones from blue dragons in the rimmington dungeon in 1/3 of the time it takes me to get 8 or 9 bones from frost dragons at neitiznot.
Right now there is no reason for anyone to kill them.