I agree those kind of questions seem weird and invasive to me. And asking guests why they are travelling here would be idiotic, as this is a beach town vacation destination.
The only times I reply to a RTB with questions are if it’s a newbie guest, or one with no or only one review, who haven’t sent a message along with the request that would indicate to me that they were clear on what they were booking.
And then the nature of my questions are geared to determine if they’ve thoroughly read the listing. Like “Are you aware that my place is a 20 minute walk from town and the beach?”