Hi xerx, I'm another organiser of this event.
You can join World Socionics Society by clicking on the link, being logged into Facebook, and clicking Join.
https://www.facebook.com/groups/worldsocionicssociety/
As for our costs, here's the breakdown:
Gulenko's speaking fee: 2 hours @ US$70/hr = $140
Western Union transfer fee: $10
To cover crowdfunding website (4%) and Paypal/credit card (2.9% + $0.30 per transaction) fees: $20
We were going to do this as a webinar where everyone pays to attend, but because we could end up with far too little or too much money that way, decided to crowdfund it to get just the right amount, and be able to offer the recording free to the socionics community after that. So we ask people to consider how much you would be willing to pay to attend a webinar with Victor Gulenko, and donate that fee - with the bonus of knowing you are contributing a valuable resource to the community as well.