"My gribe is based on the number of webmasters who email them and get no reply regarding their droped domains. "
There have been several instances where Ultsearch picked up domain names which were owned by former spammers, and consequently some of the blacklisters assume that Ultsearch *was* the spammer, and have blacklisted Ultsearch and entire ranges of IP addresses used by Ultsearch.
The result is that when Ultsearch *does* reply to some people, they never get the email because those people are blocking the reply.
The entire country of China blocks email to ultsearch, for example.