I do use the pellets for the chickens sometimes - just in places where there is concentrated wet, like when Maggie had diarrhea and always slept in the same spot, I would sprinkle it on the ground there.Yes indeed, astonishing is the right word and it makes me a bit mad too to tell the truth. It feels an awful lot like they are taking advantage of our love for our pets. I will be using those hard wood stove pellets as a bottom most layer for my coop bedding with pine chips on top to soften any landings from the roosts in the spring when I do a total clean out. Seeing as how I have a dirt floor coop this should work pretty well.
The one issue is they compost really slowly. It isn't a big issue for me as it is better it take a while when composting cat waste and I have the space - but I am about to use one bin and it has been about 4 years since I left that bin to mature!
It is still better than the mining that is required for the clay litter. I sometimes use it un-composted as mulch around trees, and the horse stall ones are a bit darker so it is less of an eyesore when it hasn't rotted down.