Having to pay for a whole course up front without being able to watch a class to see level
By the way this local lady also puts on a show for which the tickets, as advertised to her class are £15.50, £7.50 for children.
Last I checked Sufi Masters taught meditation and religion rather than the normal type of belly dance.
I did initially study with a Sufi master, Adnan Sarhan, an Iraqi teacher who is now in the US.