It's definitely a plus and shows that the witness owner want to add value to his/her participation. Pure coincidence, @roelandp just launched his own full node cluster made of 3 hefty servers: https://hivean.com/hive-139531/@roelandp/announcing-my-hive-full-api-cluster-hive-roelandp-nl
The requirement I mentioned is what is defined in the whitepaper. But the community is voting for witnesses so the community can set the requirement.