The reported reason to keep Eddies

Currency and reroll details from the transcript, with unknowns kept explicit.
TopicReported in the narrationNot provided
EddiesSave some for rerollsHow to earn them or how much to hold
RerollsExpected to use EddiesPrice, target, odds or outcome

Check the cost before you spend

When your current session presents a reroll option, read its displayed price and what the action changes before confirming. Compare that cost with other options actually shown in your game. This cautious check does not assume that every reroll has the same price or that any particular reroll is worth buying.

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What is still unknown about the economy

The supplied transcript gives no prices, reward values, earning activities, currency cap or penalty for spending. It therefore cannot support a fastest-farm route, an exact reserve target or a claim about which purchase is best.