Been sitting down with a lot of consultants lately to discuss their seminars. I've spoken with 3 different consultants that plan to do seminars and then wait for their attendees to call them. As I have difficulty controlling my dumbfounded looks, I usually ask "Why?". They all said that they never had to call people. These are the same people that usually want to do a seminar and make money from the seminar because they haven't been billing enough hours. Some were honest and said that they "aren't the kind of sales people that" called and asked for an appointment. Of course, they don't see this as a weakness that needs improvement. They just think its "them being true to who they are": Not the evil salesperson that their mom told them not to be.
Here's a bit of advice for anyone considering being a consultant: Your first job is sales. Get over it. Pick up the phone.
And if you are going to go to the trouble of putting together a successful seminar (ie one that is attended by people that aren't already your clients, partners or friends), than you better be prepared to pick up the phone afterwards. Else, you just wasted a lot of time.
The other way to look at this, if you still think "you're bothering someone by calling them to see if they want to talk further about their needs" is that you are doing them a favor. If they were willing to shell out a few bucks to come to listen to you speak in a room with a bunch of other people, they would most likely be honored if you were to give them a free 1/2 hour consultation by phone or face to face to talk about their individual needs and problems that you might be able to solve.