I love the idea, but there needs to be more information.
Where is this geographically? Are there separate SF and NY groups? Additional ones? Do they meet in person? How often? Or is this all via webcam and e-mail? Is this more mentoring or support? More one-on-one or group? What kind of a time commitment are we talking about? Is the 150-member limit per geographic area, or global? Why 150, if it's all groups of 4-8 anyways?
I understand what you are, but I don't have the slightest idea what you do.
* Mastermind groups are run on Skype or Google Hangouts
* It's a global group
* We have group owners (volunteers) who start groups and organise them to suit their goals and timezones
* It's mostly a tech / web audience
* It's more support and accountability than mentoring
* Mastermind groups are run bi-weekly (depends on the group owner). We're looking to introduce weekly mastermind groups on specific subjects i.e. PR, SEO, pricing, partnerships, etc.
* We also include a weekly summary / round up of discussions that have taken place in the group that week and on Mondays people post their goals for the week, which other people comment on / offer help / ask questions
I think your idea has enormous potential, don't screw it up :-)
To quote General Rumsfeld, a solo founder usually has a lot of "unknown unknowns" because a single human being is likely to have a lot of skill gaps that they themselves are not fully aware of.
Many solo founders could probably see an order of magnitude in the success of their products if a bunch of peers give suggestions like "Dude, this page needs a link for tweeting your completed images" or "You need a call for action on this page" or "This font makes your web page look like it was created in 1998"
The dynamic of a startup is very different when you have 2-3 founders, in that case it is probably better to work as a team to try and resolve these types of problems, but for a solo founder a semi-confidential outside opinion could be valuable.
Asking "real-world friends" about these types of things doesn't really work most of the time because they may not understand startup tech and because polite society usually follows the rule "If you have nothing nice to say, don't say anything at all."
Where is this geographically? Are there separate SF and NY groups? Additional ones? Do they meet in person? How often? Or is this all via webcam and e-mail? Is this more mentoring or support? More one-on-one or group? What kind of a time commitment are we talking about? Is the 150-member limit per geographic area, or global? Why 150, if it's all groups of 4-8 anyways?
I understand what you are, but I don't have the slightest idea what you do.