I'd think free wooden pallets would attract more fish than the spools, especially at $40+
Jeeez RW what kind of operation do you think I'm running here? We're talking high society, no government housing for my babies! But no worries, as I wouldn't tell the fish how much I spent on their homes anyway.
All joking aside, I'm just thinking from a variety standpoint the shape of these would make for some interesting possibilities. see attachment for some ideas I had in my head.
You could stand them on end, side, cut them in half for a hump, embelish with pvc for a bush, etc. etc.
I agree I wouldn't shell out $40/ea for them, but if someone had access to them free or cheaper they seem like a sturdy alternative to get creative with for sure!