The people selling the seminars?
Nobody gives seminars talking about how the earth is round, that's an accepted fact.
Flat earthers say there's some big conspiracy to fool people into thinking the earth is round. I'm asking--why? Never gotten a good answer (because there isn't one)
At least with the moon landing/JFK assassination/9-11 truther conspiracies, there's a somewhat plausible motive for each conspiracy. But flat earthers? They all seem to ignore this question