Yes if you are creating content regularly, commenting and engaging you would have built up a strong Hive power, but for some that do not have the Hive Power these simple tasks can eat away at resource credits quite fast. However even with strong Hive Power this tools allows you to engage many times more than your resource credits would normally allow, hence maximizing your curation rewards while using less resource credits, some of the largest account holders use this tool and with good reason.