My company "evaluates" phishing propensity by sending employees emails directing them to "honeypots" which are in the corporate domain and signed by the corporate ssl certificates. Unsurprisingly, many employees trust ssl and enter their credentials. My takeaway was not that people are bad at security, but that they will tend to trust the system if the stakes don't appear too high.
I agree that email is an attention-sucking mess, but I see the problem differently from jacobjacob. I would happily get all the emails from the rationality community; my problem is that email is dominated by marketing, mailing lists, etc.
I think that using earn.com is likely to exacerbate the problem of unrequested marketing emails. It is free to send messages, and the sender only pays upon receipt of a response. This is like selling advertising on a per-click-though basis rather than on a per-view basis, and if it took off I would expect spam to quickly d... (read more)
One reason to escew earn.com specifically is the use of bitcoin. Proof-of-work cryptocurrencies are a major waste of energy (0.2% of the global energy use currently) and should be avoided by rationalists.