Pricing is based on the number of members - silver gives you up to 180, and the gold plan allows up to 500. If your company have 500 employees out speaking at conferences your annual events budget already measures in the tens of millions of dollars, at which point we're a small fraction. If we can make your event participation just a few percentage points more effective (and we're confident we can do a lot more than that) we're an absolute bargain.
I see, you're pricing on members, and I was looking at the useful features (like branded subdomain and suchlike). I wasn't clear what 'members' were, they're speakers? So this really isn't a product for companies with < 20 staff and only 3 speaking, but wanting to show off all their talks in one place...
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.