Image Therapy is the heart of Slimming World - that's where all the ideas, support and tips come from. If you're feeling down, someone will cheer you up and if you're walking on air it's good to share how you feel.
IMHO if I paid £4.50 a week to go to a French class, I'd want to stay and get my moneysworth.
Incidentally, the new member introduction talk should take less than 1/2 an hour - any more would be information overload.