Three numbers decide whether a code is worth anything. Find them with the code applied, find them without it, and compare.
The wagering requirement and its basis. A requirement of 40 times applied to deposit plus bonus is roughly twice the turnover of 40 times the bonus alone. A code that raises the headline percentage while quietly moving the basis has made the offer worse.
The maximum cashout. Bonus terms frequently cap what can be withdrawn from bonus derived winnings. A larger bonus behind the same cap is not a larger offer.
The game weighting. If slots count 100% and live tables count 10%, the printed multiple understates the real turnover for anybody who plays tables. Bovada publishes its contribution schedule in the bonus terms: slots and specialty games 100%, table games 20%, video poker and blackjack 10%, roulette and baccarat 5%. Its welcome headline runs to $3,750, and the rollover multiplier lives on each individual promotion page rather than the general terms, which is exactly the kind of gap to close before depositing rather than after.
When those three are identical with and without the code, the code is tracking, not value.
Codes that do change something usually change the size or the shape, not the requirement. A partner deal might add free spins, raise a match percentage or start a rakeback period. Gamdom is reported by a secondary source to run a 15% rakeback for seven days through the code GAM15, with no wagering requirement published alongside it in the sources we hold. Treat unverified figures of that kind as claims to confirm in the cashier, not facts.