If people will go back and read what I originally posted - I said that it isn't the birthdays I don't like. I like the birthday party.
What I don't like (and this may be a local thing) is dealing with birthday parents, and with the lousy money.
In my area there are literally hundreds of magicians all trying for those same birthdays. There have been some very sneaky underhanded stuff from locals like scooping shows, under cutting and spreading rumours about why your show is a bad idea.
Please don't think I hate birthdays or have anything against people who do them and love them.