You are correct. It is rare that they get papped. We see them if they want to be seen. That costs the Sussexes $60 million dollars a year. We don't know how much it costs us/the royal family as they don't tell us.
But we get stories. All. The. Time. 40 a day according to @Roussette. The stories are almost entirely negative when about the Sussex Two, but almost entirely positive about everyone else.
At that point we should ask questions as to why?
Also keep in mind that the Sussexes are now living away, making their own money. They pay tax. They cover their own costs.
The rest of the gang however live here, cost us money, have secret agreements with government, secret wills, have palaces and castles on standby in case they visit (while lecturing on climate change), opac finances, and on, and on, and on.
In essence they rip us off. And we roll over because they might come to cut a ribbon and smile at us, thereby reassuring us that they are lovely. But really we should be thinking- my what big teeth you have....
To me, the Sussexes are the heavily promoted distraction.