I too am baffled by the great return.
So Meghan setting up pap shots with Malala, Harry at the rugby with his royal ish cousin, similar to William at the football. And some pontificating on ishoos at various charity gigs. If successful, this would give them free accommodation, at least some security, an income and royal adjacency which would help to sell Meghan’s tat.
But how would this give them an income?
Charities might pay 'expenses' for a 'visit' but that's not serious money. And Meghan's brand is probably a loss maker anyway, but its got a 'SoCal' theme, so her living in rural England isn't going to help.
I also think being in England will emphasise their lack of royal adjacency even more than being in California. There, they could at least play at being 'American royals'. But back in Britain, living down the road from the rest of the family, most of whom seem to want to have nothing to do with them, with actual royal engagements going on without their involvement, it's just so clear how out of the fold they are.
At the very most they might get some security costs covered, but that in itself is hardly enough to warrant such a drastic move. 'Tis a puzzlement.