If you're in for often very long days on your feet in rain or shine and willing/prepared to stay focused 99% of that time (in addition to Maeloch's slightly understated 'job description'), you should give it a try!
Here's some more info that might help you:
https://www.scca.com/pages/i-want-to...ore-about-scca
http://www.racer.com/scca-home/item/...a-volunteering
There are several incentive programs available from various regions.
Good luck!
Edit: at Pro events there are often updates provided over the radio to keep us corner workers in the loop in case you lose track of what's going on. Comes in handy for the endurance races, not so much for the shorter races like Indycar, etc.