Hey Paul, when you're limited to 30 campaigns in RTP, you're also limited to 30 segments. I've heard that if you ask the right people, you might be able to have that number increased. There's also a chance that your account was just set up wrong (if you're eligible for more than 30 campaigns), and you just need to ask them to increase your number of segments.
I think it's silly to have a 1 to 1 relationship between the number of RTP campaigns you're allowed to have, and the number of segments you're allowed to have.