Proof gets useful when it shows the operating choices, not just the happy number.
Nomada: Five hotels and three restaurants on the Central Coast. Jay Street moved ad spend the group could not see into Google accounts it owns, then tied that spend to bookings on the hotels' own sites. During the period in the published study, those bookings produced 11.6x as much revenue as the group spent on ads. At launch, each hotel booking on the group's own site cost an average of $39 in ads.
Kirk's Steakburgers: This is same-metro method proof, not a multi-city example. Campbell, Palo Alto, and Santa Clara had separate ads and results instead of one blended number. In May 2026, Google advertising produced 2,741 incremental confirmed restaurant visits on $2,275 in spend. The dollar return is an estimate and says so.
Carrubba Luxury Restaurants: Three fine dining rooms under one family, each with separate ads and private-event inquiries, plus one view for ownership. Private-event inquiries rose 56% during the two months measured. At one restaurant, the standard report showed 10 reservation clicks while the website showed more than 4,000. Finding that 400x blind spot stopped the family from making decisions on a broken number.
Key takeaway: Good group proof shows what changed at each property, how the total was built, and where modeling begins.
Nomada case study Kirk's case study Carrubba case study