I think it is a great idea and don't see any issue with participating.
As for divulging confidential information, well you can politely say that your not prepared to go into detail on it, but then I don't have many secrets, as such.
Some of the best things I learned early on were from people with far more experience than me, not just from the world of carpet cleaning, but also on the business aspect of things. What these people provided were ideas, techniques and concepts that you may only take one part of and then apply it to your own business, (which are often completely overlooked by newbies) things you would never have thought of yourself and yet provide you with something that decades later is still at the heart of your business. So having been the beneficiary of other people's generosity and time, I see no reason not to do the same now that I am at the other end of my career and could possibly help others with what I have learned along the way.
Simon