I haven't been to many but it's still too many to count. Have you really kept track of how many you've been to?
It's really hard to keep track of all the gigs. Do you count only one-band/artist gig or mixed gigs/festivals as well? I think I've been to over 30 in total, but it seems too few still..
I've been to loads of local gigs and a few famous ones (I saw Sigur Ros and Death from Above 1979 back in t'day!). Best gig I ever went to has to be Limp Bizkit. I've never had so much fun at a concert. Say what you will about Bizkit, but their live shows are pretty phenomenal.
By the way, saw Crippled Black Phoenix in Berlin on Friday, it was a lot of fun; couldn't even imagine this amount of drive from (technically) a post-rock band!
Zero, I always have been wanting to go to a concert at least once before I pass away especially rock or heavy metal concerts such as bands like Metallica, Lynyrd Skynyrd, ACDC, Motley Crue, or KISS and among others.