Which cloud service category brings with it the most expensive startup costs, but also the lowest costs for ongoing support and maintenance staff?

IaaS has lower startup costs as customers only pay for infrastructure, but requires significant customer staff for OS, middleware, and application management, leading to higher ongoing support costs.

SaaS offers a complete, ready-to-use application, which often entails higher upfront subscription fees compared to raw infrastructure or platforms, reflecting the full management by the provider. However, the customer's IT staff has minimal to no responsibility for underlying infrastructure, operating systems, platform, or application maintenance, leading to the lowest ongoing support and maintenance personnel costs.

PaaS has moderate startup costs and reduces some maintenance burden (OS, middleware) compared to IaaS, but still requires customer staff for application development, deployment, and data management.

DaaS (Desktop as a Service) is a form of SaaS, and while it fits the description, SaaS is the broader category that encompasses this characteristic most broadly.