Come on you can name plenty of them. Note it wasn't me that used the term bread and butter sire in the case of Roc De Cambes. What do you term a B & B sire? One that is comparatively cheap and produces heaps of winnners across average mares. Zed comes to mind. Per Incanto - started out cheap not so much now.
Roc de Cambes served 14 mares in 2020, 34 - 2019, 45 - 2018 (Princess Lowry year). From the 2018 crop only 12 have hit the racetrack. Doesn't the market give a good idea of his success?