These are all questions you should be asking the person who set up the workshop for your guild. I would assume the teacher required a minimum amount to put on the workshop and would get more money if she is teaching more students. Does your guild have a set of written policies and procedures regarding workshops? If not, you might want to volunteer to start a committee to work on one. I have been to several workshops with my guild and some have been well organized and others not. The less successful ones were sometimes the fault of the teacher and sometimes the fault of the guild program director.