if you never get a gallery, it's not a tgp - it's a cj site. cj stands for circle jerk.

most tgp owners make sure that a new surfer's first click goes to a gallery and also that no more than 50% of following clicks go to other tgps. that is a very common rule on tgps.

also tgps don't allow repetition but if the thumbs and pics aren't quite the same size, it's impossible for the script to know. and i don't know of any tgps that check fhg's for non repetition. you could be seeing either a sponsor who rotates the gallery daily and doesn't have enough sets or else a tgp owner with a rotation script that either isn't working well or doesn't have anywhere near enough galleries.