It seems like they all want to lowball the fuck out of you and try to get it cheap. Some tags with ed and ing at the end are getting twice that, and a 12 letter tag I used to have sold for $90 a month or two ago. Compare it with similar tags in the marketplace if they're not giving good estimates.
People appraised another tag I had at $15-35 and I sold it for $65, just another example of how estimates are often low.