...........There are people out there who have seen Dan, and weren't blown away. Now do they want to go on public record saying something negative about someone for no real reason; that's another important question to ask.
Let's say Dan has a 90% seminar success rate. Thats a pretty good rate of people who like what he's doing to people who don't care for what he's doing. Out of those 10% who didn't like it, how many were just underwhelmed, but not upset, I would guess 5%. How many of the 5% who were upset, would actually make public note of it, maybe 1% or so, how many of that 1% use internet forums....
See what I'm saying here? People are more likely to talk positively about someone then negatively. So it's rare that someone is upset enough, or public enough to want to blast someone else that they've had a negative experience with, unless it's dramatic.
Another thought here is what hard work is involved with the solo training offered by Dan (and others) and how long it may well take to achieve a level of proficiency that provides useful results, results without thinking. Many will not take the time and will drop the practice if they don't see results the following week or so. Some will see the level effort needed to even get started and be underwhelmed..... It is easier to be underwhelmed than do the time.