I was invited to speak at NDC in Oslo, Norway, so I travelled internationally to speak. The event gave me a free ticket, and I was not paid to speak. The event assisted with part of my travel and accommodation. My employer did not pay my travel expenses, and I was working while speaking at the event. It took me 2 days to prepare for my 60 minutes speaking slot, and I had a mostly good time. I'm a man who has been speaking for 10 years. This was a for profit event. Also, The conference organisers were extremely picky with the flights they were willing to cover, and I ended up adding money out of pocket to book the flights I wanted to (in economy class, of course). Conference tickets are very highly priced, so it seems that the organisers simply don't care or don't want to pay speakers.