Great question.

I agree with a couple of the other experts comments, the idea is the least of your worries. Most people are too busy to want to copy someone else's ideas. I would advise speaking to someone else who runs a non-competitng business for advise. (I'm happy to help.)

You may have heard friends say "I thought of that idea 10 years ago" about a business which they seen on the news which is the next big thing. However it's not the idea which makes you the money, it's the execution and dedication to making it the best product or service possible. No one else can copy your passion or originality.

My advice... Go for it!