Is it normal to require 600+ combined karma to post??

Hi! I'm new to reddit. I've read some posts here and there in the past but I've never had an account before. I only made it because I saw a very interesting post about an advent calendar exchange that I was very interested in.

After making my account I realized that to reply and participate I needed 600+ combined karma and 3 months on reddit to do so.

I've already read everything about karma so I won't bother you with common questions, but I'm starting to realize how hard and unreachable for a newbie is to get 600+ karma and I'm wondering if this is more or less common in some groups/communities or if it's a bit unreasonable?? Maybe it's this high because you are expected to share your personal address to do an exchange??