A productivity of 100% means, that every visitor clicks exactly 1 link. 200% would be 2 clicks from one visitor and 50% means, that only every second unique leads to a click on a gallery-link. Your traffic script has all these information for you. So you can see, which trades send good traffic and kick the others... Usually, search-engine traffic has the best productivity...
Looking forward to find out how productive my first thumb-tgp will be
