I think it would also depend strongly on your skill level(s). For example, a master in Larceny might be able to steal close to £100, possibly more, depending on the victim described. A novice, however, might only be getting five mizas, or even just coppers or silver pieces. A novice also houldnt be going after the richer people in the population.
And there's always the chance that you might get caught! I know that in Ravok, I like people to discuss with me or Abstract their basic plan before they do anything illegal with rewards, so like Ink said, maybe throw a PM in the direction of your ST just as a courtesy "heads up". Also remember you still get points for failing, and we love seeing characters in hardship, rather than reaping the benefits every time

Good luck and happy... stealing!