Yes, there is no free lunch. Patrick shares some really valuable info and shares his approach. Don't you find that valuable enough to share a tweet about, especially since you can delete the tweet right afterwards? If the tweet is too much, just wait and pay for it when it comes on sale for a price.
My comment states that the buttons don't appear for me (and I don't have a twitter account anyway). I don't see anything wrong with viral mechanics (for example, I'm very impressed with how dropbox does it).
I'd feel more comfortable if this price was stated upfront, before harvesting my email. As it is, it seemed that giving up my email was the "price".
I highly recommend watching the videos.