Hey, I have talked to you before and since we are from the same province, this might be helpful. One of my friends was a judge for 3 years, and just quit this year because she got fed up of not being paid right. Some invitational meets will give you a gift card or a gift basket instead of paying you, and they don't tell you beforehand. If you work sanctioned meets they are better though.
Also if you are competing at a meet that you are also judging make sure you make it clear which sessions you can and can't work, because they may try to get you to work your session if it isn't clear.
Sometimes its tough to put up with but its worth a try!