I have successfully desynthed 11 of these bastards so far and nothing to show for it but a handful of sand. And yet I keep trying.
Cat Became Hungry was claiming a 25% success rate on desynth; after my 6 or 7 straight failures I thought it seemed wrong but now I'm averaging out. RNG gonna RNG.
What confuses me is the lack of these on the MB. There are like 2 on there. The gathering threshold is fairly low, the weather/time window is pretty generous, and it's a pretty simple double mooch. Barring your horrible desynth luck, it seems like a market people should be flooding. There just must not be many people fishing? I wonder if that means there are undiscovered desynths. :/
Also there's apparently a fish that requires 403 gathering?!? HOW.