Good is anything that help you earn your bread and butter (B&B). Better is anything that helps you earn a coffee along with the B&B. Best is anything that could make others crave for the same. On that note, profit is a relative term. Work out your cost/expenses and mark up with the percentage profit that you would like to make. Sensible would be something that would make the perceived value of your service much more than the cost involved in availing the same.

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