"in a single day"? You're not serious are you? Jason and the team have been working to build their expertise and reputation for YEARS and YEARS (and YEARS) to get to this point. Far from getting $37k for a "single day", attendees are paying for the insight that comes from YEARS of 37signals' work. No one gets $37k for one day of work. They might have an additional $37k in their pockets in one day, but they EARNED it over years and years.
yes, I'm serious. 37 seats x $1000 = $37k in pocket as you said. No one is debating the fact that they are only able to do this after years of hard work. Could Joe Schmoe of the street do this? No, absolutely not. But putting "How to make $37,000 in a single day after YEARS and YEARS (and YEARS) of hard work" doesn't exactly fit in the title field.