Good Idea/Bad Idea?

Obviously the WSO model is a success. Put up a course of some sort for free or a reduced price, then upsell on other services or private mastermind groups.

I see lots of people that offer services to small businesses such as SEO, lead gen, reputation management, or even consulting. But I don't see many people that put a basic product out there like a WSO to their local small businesses as kind of a loss leader in order to bring them in. Sure, some people give away websites, but that is a lot of work that must be replicated time and again. A product is created once and distributed over and over.

So what about putting together some sort of online course to offer local businesses for free or at a low price, then following with the opportunity for more interaction like those that sell WSO's? Maybe a webinar or e-course on a relevant subject to those small businesses, and then offer them more interaction through a mastermind group where you act as a consultant and lead the group for a monthly fee. Seems like one could sell services such as web design, SEO, or the like off of a platform like that, and would get to have paid interaction with those small businesses, almost like a paid little mastermind forum.

Anybody ever try this, or something similar? Did it work out for you? Or if you haven't, do you think that a model like this would be a good idea, or a bad idea? I can see a lot of potential upside, the downside would maybe be the amount of time that running a group might consist of. How much would you charge each member knowing that some people in a mastermind would need little of your time while others would be constantly asking questions and seeking advice?

Just an idea that I had. Maybe something like this exists and people do it all the time and I'm just unaware. Seems like an interesting model to me.