There is the mindset that you'll win the lottery, get bought out, and become rich. It's all about users, not revenue. It becomes a lottery, where a few get very wealthy, and the rest make nothing. That's not Freemium, of course, that's "free", as in twitter, facebook, etc.. However, to me, Freemium is almost as bad a bet.
With Freemium, I end up burning so many resources with scaling issues, trying to service all of these non-payers, hoping I'll "win the lottery", by getting enough actual payers to finance things. The examples they gave were good cases in point of services that struggled under the load of the non-payers for a few years.
I would like to just charge from the get-go, and avoid the scaling issues that freemium implies.