I've been dancing and going to nights for about a year now, As much as I agree that yes, It does help people to get the confidence to go out on the floor by showing them something introductory, I don't feel like that should cost £150.
I have had some young people at nights come and ask me how to dance, I showed them a basic step and they asked me what next? I said "I'm not gonna show you what's next because then you will just dance like me", I think the way people dance is like a fingerprint its individual to you and I personally enjoy seeing people who do something different with the way they move and express themselves to the music.