Help me calculate usage limits for my AI tool subscription:

My tool details. First ask me for:
- Average cost per complete usage session: $[your tested amount]
- Monthly subscription price: $[your chosen price]

Calculate and suggest:

GENEROUS LIMITS (70% profit margin):
- Maximum monthly usage to maintain profitability
- Recommended limit with buffer for variation
- What this means for typical user experience

NORMAL LIMITS (85% profit margin):
- Conservative usage limits for healthy margins
- Recommended for most AI tools
- Balance of value and profitability

STRICT LIMITS (95% profit margin):
- Very conservative limits maximising profit
- Risk of customer dissatisfaction
- Only if your tool provides extremely high value

POWER USER TIER:
- Higher usage limit for premium pricing
- Suggested price point for heavy users
- What usage level justifies the higher cost

For each tier, explain:
- Monthly usage limit
- Cost breakdown
- Profit per customer
- Risk assessment

Base calculations on real API costs, not theoretical numbers. Use Python or a similar tool for calculations.