Sponsorship spending is defended and attacked with unusual heat inside companies, largely because the standard measurement apparatus was designed for something else.
There is no click to attribute
Digital measurement follows an identifier from exposure to purchase. A logo on an outfield wall, a jersey or a conference banner produces no identifier at all.
The exposure is real and the record of it is not. Anyone who saw the logo and later bought is counted as direct traffic, organic search or word of mouth.
Which means the channel systematically appears in reports as smaller than it is, while the channels that capture the eventual visit appear larger.
Effects are indirect and delayed
Sponsorship generally works through familiarity rather than persuasion. A name encountered repeatedly is more likely to be considered when a need arises, possibly months later.
That delay places the effect outside any reasonable attribution window. The exposure and the purchase are separated by more time than the measurement can span.
Familiarity also has no obvious moment of conversion. Nothing happens on the day the effect occurs, so there is nothing for a system to record.
Audience overlap decides value
The measurable part of a sponsorship is whether the audience matches the buyer. A regional business sponsoring a local team reaches roughly the people it can serve.
National properties reach far more people and a far lower share of relevant ones. The cost difference frequently does not reflect the difference in usable reach.
Business-to-business sponsorships of trade events invert this. Audiences are small, expensive per head, and composed almost entirely of qualified buyers.
Association carries risk in both directions
A sponsor's name is attached to an organization it does not control. Performance, conduct and controversy all transfer some sentiment to the brand alongside it.
Contracts increasingly address this with morality provisions and exit rights, which is an acknowledgment that the association is the product being bought.
The upside works identically. Sponsors of a team or event that becomes widely admired receive a share of that regard without having produced it.
Better evidence exists than click data
Geographic holdout tests, where spending runs in some markets and not others, produce comparative evidence. Differences in branded search and direct traffic between markets are observable.
Brand tracking surveys measure recall and consideration before and after a sponsorship period, which is slower and closer to what the spending actually changes.
Neither method produces the per-dollar precision digital reporting offers. Companies that demand that precision usually conclude the channel does not work, on evidence that could not have shown otherwise.