Yep. But even then you don't "pay" that fee (it's deducted and you get the net) and you don't have a set monthly fee. So there's no hard cost of setting up and maintaining a site with them.
Yep but you're getting a little hung up on definitions and missing the larger point. Ie by proving that it's not a freemium model you're not really negating the central point which is that the barrier to entry is substantially lower (non existent) than with any/other competing services thus drawing in exponentially more users than similar services resulting in a disproportionate strain on their customer support vs others.
Honestly, right or wrong - I've seen very few 'startups' really grok effective customer service (I realize I'm over generalizing). Yes, a good Knowledge Base/FAQ and ticketing/email system is important - but you need a phone number, you need a call center probably too (even if its only 2-5 people answering the phone) - you need more than email and ticketing - most technology is complex enough that you need a person to talk to over the phone to hold your customers hands - IMO - this is even doubled for anything that need to integrate with your systems or has a device on your premises, but is also applicable to a complex web service - I strongly believe it drives long term customer retention and eases on boarding.
I'll point out as to why I believe this - outside of the technology hubs, the folks with money are not the 'internet native' generation, they're older and less comfortable with technology then we are.