Tough to compare to gpu mining, since you would be lucky to get a GPU close to MSRP. There is also the eip 1559 eth mining profit drop in a month, and Eth going PoS in like 6 months. At which point GPU mining will be flooded with a ton of extra hash power so even the low profit coins will rise in difficulty.
It sounds like you paid retail for new drives, but chia was always intended for the overprovisioned capacity already in the world. You might pull a profit selling your drives now if you got them before the prices greatly increased.
The thing to keep in mind is that chia was always going to be a low profit margin crypto to mine given the extremely low barrier to entry, and huge amounts of storage already out in the world. That said, if you are pulling a profit at all are you really losing anything? The entire point of chia is it’s the extremely low cost of operation farming. Those drives can sit farming away for years and have resell storage value at any point.
The only reason I would stop farming is not covering electric costs if I had to sell XCH for it, so $20XCH is my cutoff point where I disconnect chia drives.