It's opinion as to whether any fee = a price. Where is the dividing line between selling the parrot and cage and rehoming it? I agree $20 is ridiculously low to be flagged as selling, so it's probably some moron who thinks it shouldn't go to a new home at all. No matter whether it would be better in a new home due to circumstances, it's just the thought of "forever home" as if people don't have things change in their lives.
It's not my opinon about it being a rehoming fee or price, just saying, that's how the CL morons thing. They're crazies.