How do you price managed services for website maintenance clients?

Context: We just rolled out our 'Website Maintenance & cPanel Management Services' and are seeing some initial interest, which is great! However, we're really scratching our heads on the best way to price these offerings.

Problem: We're trying to figure out a sustainable pricing strategy for our new managed services. We want to be competitive but also ensure profitability. We're currently debating between hourly, retainer, or tiered package models.

Specific Questions:

• What pricing models have you found most effective for similar website maintenance and cPanel management managed services?
• How do you factor in different client needs (e.g., a simple blog vs. a complex e-commerce site) when structuring your pricing tiers?
• Any advice on how to clearly communicate the value of ongoing managed services to justify retainer fees?