Did legion workshops make money?

[richsc]

Other than the book I read saying the workshop belonged to Legio XX, the antefix and tiles are all marked Legio XX. I can only wonder if every legion had such workshops. The production must have been significant, since so many examples still exist. While the particular antefix of the 20th may not have been popular, Roman villas used antefixes a lot, and this must have spread. <p></p><i></i>