A 30 amp circuit will not be overkill if you are doing arc welding or running other heaviy industrial machinery. If you are simply running audio components, its way overkill.
Please visit this web site, then rethink your comment.
http://www.vtl.com/pages/mb750specifications.html
ONE single VTL 750 amp draws 11 amps, A pair (required for stereo) Draws 22 amps. I use four VTL 750's in my system, even a single 30 amp break would not support the amps, much less the rest of my equipment.
There are plenty of audiophiles with more equipment than me, not even touching on their HT system.