First of all, AAA games refer to games made by massive studios (usually numbering up to 10,000 people and above). These games have budget of over $100 million.
On the other hand, indiegames are made by a small team of people with a smaller budget.
In my opinion,it would be unreasonable for indiegames to cost as much as AAA games because
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AAA games have a higher level of graphics
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AAA games have multiple hours of gameplay which could make their games take days to complete
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AAA need to charge more to generate more money because of its large payroll