I'd go so far as to say that a number of chain pet stores purposefully hire "moderately" knowledgeable people, or even any random person regardless of their animal knowledge. In this day and age I know that pretty much over half of products in big box stores for exotics is either subpar, useless or outright harmful, and that a number of the animals sold have no business being considered "beginner choices." But the companies need employees who will unquestioningly push for said products and animals to sell anyway. I've been suspicious of this for a while now given all the years I've tried to get a job at any given pet store but failed, and I can't help but believe it's due to "knowing too much."
Not every pet store is like this, but I'd be lying if I said I haven't picked up on some patterns...