You don't have to update. – Profit Bandit Review

FYI, if you have been a PB user and already paid the previous $15 one-time fee, you can set your App Store settings so that your apps do not automatically update. That way, you don't have to update this PB app and can continue using it without paying the new monthly subscription fee. On the other hand, the new subscription fee still provides a great value if you are an active Amazon seller as the expense is paid for quickly.
Review by Blacklister guy on Profit Bandit.