That deal isn`t all that lucrative because they are obliged to do it and when the movie they must do (regardless of script quality) is shooting, they have to pass on other opportunities due to conflicting schedules. And some of those offers may be really great deals. For exmaple, Ronan passed on TH because she`d film a supporting role for over a year while passing on leading roles. Now she has 3 potentially big movies in the can (TH Host - lead, Order of 7 - lead, Noah - co-lead or big supporting) while Evie Lilly is still filming her Elfette that is very little in the first movie but has bigger role in the second, although not as big as anything Ronan is in. See what I mean?