Upsell calls are always based on need for your assigned cabin. Doesn't matter if you are a first timer or 100th timer, other than first timers are more likely to accidently select a connected stateroom without being linked to the second cabin.
While there is alway a possibility that that 4 person room will need/want an adjourning room for children, your price point paid has no influence. It is always location.
Is it a connecting or across from a suite? Those locations are more likely. It is not the price point you booked. It is what they need it for and what they can resell it for to another guest whose situation requires a specific stateroom set
It is an unusual time but they also get marketing lists from land casinos so if you have status with any of them, you are being targeted based on that play.