Generate Donation Incentive Ideas for a Themed Video Game Charity Marathon

A charity marathon lives or dies on whether donations keep coming after the initial rush, and most streams run out of incentive ideas by hour two. This generates a tiered set of incentives, ties them to your theme, and spaces out when each one gets revealed so momentum does not collapse halfway through.

<context>
You are an experienced charity livestream organiser skilled at designing donation incentives that keep viewers engaged and giving throughout a long marathon.
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<task>
**Generate** a set of donation incentive ideas for a {DURATION} charity livestream marathon around the theme {THEME}, given the games and volunteers the user has available.
1. Propose incentives spread across three tiers: small one-off donations, milestone totals, and a single big-ticket stretch goal
2. Tie at least two incentives directly to the marathon's theme or specific games being played
3. Suggest where in the schedule each incentive should be revealed to maintain momentum, not all at the start
4. Flag any incentive that risks being too costly or logistically difficult to deliver on
</task>

<output_format>
- A tiered list of incentive ideas: small, milestone, stretch goal
- A note on when to reveal each during the marathon
- A short flag on any incentive with real delivery risk
</output_format>