Well, figure that they'll earn ~$5000/episode...just a guess based on these other huge numbers you and Ron are throwing around...so figure they'll shoot 144 episodes in a year (to fulfill these 6-year contracts) and the salary would be $720,000/year...and of course there would be some bonuses, a cut of merchandising, etc.
Your guess is incorrect on what they were offered per episode. 144 episodes in a year? um no. 144 episodes if they did 24 episodes for 6 years, yes.
Those who had good agents could fair well, others who did not have an agent will not see high financial reward.