I've encountered some very different scenarios regarding sellers breaking up with a prospective agent(s) over differences in perceived value of the home and the starting list price that would reflect it. While not typical, I've also seen where I and an appraiser disagreed prior to listing a home on value with me being significantly more accurate than the pre-listing appraiser in that scenario.
Examples from My Experience:
My 3rd Agent Opinion for Comparative Market Analysis When Prior 2 Agents Have Major Differences
Seller Parting Ways with Me Due to My Opinion of Value Being Lower than Theirs
A Pre-Listing Appraiser States a Home is Worth More than $85k Below What I Sell it For, But The Seller Still Thought It Was Worth More Than Me
FAQs on List Price Differences:
Should You Rule Out an Agent Over Suggested List Price Differences?
What if I Want to List at a Different Price Than My Agent?
What Are the Top Things to Look for in an Agent?