I run a small web design agency, and I have Magento clients. I started offering this kind of service for Magento. Unfortunately, there is not much 'small fixes'

I run a small web design agency, and I have Magento clients. I started offering this kind of service for Magento. Unfortunately, there is not much 'small fixes' in Magento stores. Most issues or corrections take hours to investigate and resolve. I nicely failed, and went back to per hour billing.