Looks like its basically just full or other wannabe "influencers". Not an event for people actually interested in fitness, mental health, etc. but people who want to grow their social media following with these topics. Also, I wouldn't say its outside the realms of possibility the likes of Siobhan and Sinead actually paid to get on the line up as its a bigger opp for them than it is for IFS to be on the line up. Lots of conferences operate like this. Keynote, and actual headliners are more likely to be invited or paid to take part as they will draw in a crowd.