Casino bonus ROI needs a defined economic return and a complete campaign cost scope. Reconcile any bonus cost already deducted from the chosen return measure. These questions need different evidence: a campaign can show substantial recipient activity even when some players would have been active anyway. A rise after launch is an observation; the incremental effect requires further analysis.
What did it cost?
Reconcile incentive use and related campaign spending under the operator’s accounting rules.
What did players do?
Follow participation, deposits, gameplay and return activity over a defined outcome window.
What did it add?
Use a credible comparison to estimate behavior that would not have occurred without the offer.