Setting up a stupid question just to deliver a pun as a punchline is 100% a dad joke in my book.

I’m interested to hear what you think is required for a joke to be a dad joke.

Dad jokes are classically built around puns, as is the case here.

Setting up context doesn’t make this a knock knock joke.

Complains that bubble needs to pop. Is trying to sell a condo but has it priced too high to attract any buyers. Doesn’t lower price.

My dude, your desire for more money is the bubble that’s holding back the sale.

Your scenario is a microcosm of the whole market.