They got nerfed a while back, ever since the crane class has been extinct. To my knowledge they nerfed the infamous "1k slash" that everyone complained about, also DoT is crap.
Turtle is superior in almost every aspect so, just as you'd expect, people don't buy a bad version of something that has a better version in existance, for the same cost.
They cried about the 1K Slash, but doesn't know what it takes to apply xxx dots and the high CD of the skill as well lol