Playback based on the amount of wagering
Some Playback offers give you a higher percentage of Playback depending on the amount you spend. Remember though, the payout would still be based on your loss over the whole promotional period.
For example, some offers will give a higher Playback percentage based on the amount wagered: the promotion might give 10% Playback if you wager up to $50, and 15% Playback if you wager up to $100.
In this example, if you start the Promotion with $50 and wager $50, losing it all, you'd get back 10% of your losses, which is $5. But if you wager $100 instead, you'd get back 15% of your losses rather than 10%. So if you lose $100, you'd receive $15 rather than $10, qualifying for proportionally more Playback overall.