A group that buys leads centrally and distributes them evenly floods the locations that cannot seat them and starves the ones that can. The site with a booked out surgeon gets the same share as the site with open days, so half the demand queues behind chair time that does not exist while the other half never arrives where it would have converted.
Cost per arch varies between locations far more than most groups realize, and the group average hides it in both directions. One site is quietly subsidizing the media budget of another, and because the reporting rolls up before it breaks out, nobody can say which one. The differences are rarely about market quality. They are intake speed, who presents the fee, and how many lenders the site runs.
Attributing collected production to the location that produced it is the only way to allocate correctly. Without it, budget moves on anecdote and on whichever regional director is most persuasive on the call. With it, the allocation argument is settled by the ledger.