Imagine this is the relative effectiveness of inviting people:

* 50% Endorsement. (If someone endorses the meeting, half of the people invited will come.)

* 10% Referral. (Looks like an endorsement is five times more effective than a simple referral.)

* 3% Two-step. (Get someone to answer an ad, and then send them more stuff and invite them.)

* 1.0% Cold call. (Gee, you would have to make 50 cold calls to equal one endorsement.)

* 0.5% A simple email inviting a person to your meeting.

These are relative numbers, but you get the idea.

Instead of running ads, etc., make personal contact with one, two or three people – build a relationship and invite them. That will be more effective than hundreds of emails.