It certainly does add a little work -- and adds a need for cross-branding, because you need to make sure people know your witness account is actually representing you, and they should witness-vote for that and not your main, etc...

The main advantage is that in case of any server compromise, your main Private Active Key isn't in the server wallet (or the price feed config file) waiting to be stolen.

(Sorry für das Englisch, aber du willst mein Deutsch nicht!)