Self defence classes?

I have been going to Kung fu classes for a long time now and it helped me to feel comfortable when usually I would be in a bit of a worry (night times in a bit of a dodgy area for example).

But, kung fu is a long term (lifestyle really) passion and I wondered if my instructor designed a structured 4 week or 6 week basic self-defence class, do you think it would be a good selling class?

I work in fitness industry so I may have a bit of a too emotional approach and need your opinion about if that would generate interest? 

Thank you for your time and any opinion is appreciated and helpful!

Maja