For a couple who own little more than a leg of a modest racehorse (it came sixth at Newbury on Friday) but have ambitions to increase their involvement in the Queen's most passionate hobby, the news is good.
Michael and Carole Middleton could be worth in the region of £30m. That is the notional figure City analysts put on the potential value of their Party Pieces empire - but only because it is now inextricably linked to the glittering world of the Royal Family through their daughter Catherine, a future Queen.
Without that connection and its lucrative resonance, especially in the US, the company might be worth a quarter of that.
How ironic that were it not for Kate, Party Pieces and everything that has flown from it might not have existed at all.
For it was when Carole was heavily pregnant with Kate, her first child, in the late summer of 1981, and unable to continue working as a British Airways air hostess, that she started making up children's party bags which she sold to friends and neighbours for pin-money.
'I remember well how it all started,' says Matita Glassborow, 63, a charming retired PA whose wine merchant father and Michael Middleton's father were brothers, and who will be at the Westminster Abbey wedding.
'Carole was very pregnant with Catherine and couldn't possibly continue working as an air hostess in her condition. So while she was at home waiting for the baby she started making goody bags for children's parties among her friends.