Yeah, probably not worth it. BUT, I would be curious to see those that have purchased it how it holds up regulating temperature. Who knows, maybe it may actually do an OK job (doubt it), but you never know. I could see it being good for animals that lay smaller sized eggs/clutches and you were only producing a couple. Maybe cornsnake eggs, or lizard eggs.
But agree with you that for not much more, you can make a giant cooler incubator with a Herpstat, that will be bullet proof and hold 6 clutches easily.