A lot of people will get to see DevDays up and close, but a lot more won't. Will there be a free video download of all the sessions? If the goal is to make it as accessible as possible, this would really hit the spot (not to mention be wildly popular).
I think that providing free downloads of the talks creates an unfair free-rider problem in which the attendees end up paying more money to subsidize the people that couldn't be bothered to pay and attend. And for everyone who decides not to go because the videos will be online later for free, the number of attendees is reduced and the very high fixed costs of the conference have be borne by a smaller number of people.
The Business of Software and TED are very different kinds of events, where a great deal of the value comes from the relationships that are formed among attendees in the hallways and at meals. That is true at this event too, of course, but not nearly to the same extent.
I expect that this year we will attempt to record some of the sessions and make them available to the general public, but not all of them.