Built an AI outbound calling system for a solo realtor/investor in California - trying to understand fair pricing

Would love some honest feedback from people already in real estate ops or using AI callers.

Here’s what the system we handle - dedicated calling infrastructure with separate business outbound number and full telephony setup. Lead outreach, qualification, follow-ups, voicemail drops, appointment booking, warm transfers, and CRM/sheet updates automatically. The system is tailored around the realtor’s workflow and includes multi-touch follow-up logic, opt-out handling, and complete deployment/testing support of 30 days.

Trying to figure out:

1. What would you realistically expect to pay for something like this?
2. Would you prefer one-time setup + usage costs, or monthly retainer?
3. What part of this actually feels valuable vs unnecessary?

Would appreciate brutally honest feedback.