It seems to be a small low-budget event. Most of the events that I remember (even online webinars) were expensive as fuck both for visitors, speakers and advertisers. This one is cheap and affordable but the cheap price may correlate with quality in some negative way. So don't expect to find something super special there.
Being expensive or cheap is not a yardstick to measure it outcome. The organizer can decide to subsidized the price because of their passion for the general public to participate in the conference.