I like, but I'm having a hard job seeing how it's worth so much per month to customers? Silver and Gold plans are definitely not cheap at $799/month / $1599/month respectively (source: http://lanyrd.com/pro/).
It's not just for the speakers - we show team members who are attending the event as well. The primary intention of the company pages is "come and meet us at these events", so attendees are very important too.
Go for three tiers, with a carnet or book of tickets approach. Yes it's harder to implement but in think that if people pay for say hosting for talks in blocks of three or five then you canngrab the folks who just are doing one talknand want to look pros.