Yes, it's pretty much only miners selling, but only a small fraction of them sell on exchanges as apparent from the low volumes.
The original Cuckoo Cycle turned out to be rather ASIC friendly; the Cuckatoo variant even more so. But it's the Cuckaroo variants that saw the most changes to make them substantially more ASIC resistant.
So then that explains the price being as low as it is... nobody is actually using it... just sitting on it in the hopes that it might go up some day. Sigh.
update: removed comment about ROI cause I didn't do the full maths.
> So then that explains the price being as low as it is... nobody is actually using it
That comment makes no sense, since most cryptocurrencies have no use except speculation. The price is low (well, no lower than Doge) because Grin deters speculation, and hence much fewer people are willing to speculate on it.
The original Cuckoo Cycle turned out to be rather ASIC friendly; the Cuckatoo variant even more so. But it's the Cuckaroo variants that saw the most changes to make them substantially more ASIC resistant.