What Claude/AI subscription plan should a firm owner use to avoid running out of usage, and how much does it typically cost?

One member is on a personal Claude plan around $100/month and doesn't come close to hitting limits, but noted that as a firm owner processing higher volume, they would absolutely be hitting limits regularly. For heavier use, the recommendation from providers is to move to an enterprise plan, which is not a fixed monthly fee but usage-based. As an example, one firm owner reportedly spent $300 in the first three days of a month on usage — illustrating that costs can add up quickly and firms need to continuously weigh cost-benefit tradeoffs when scaling AI usage.