I know you are passionate about the project, and that's why reading this post confirms it was a good investment for me. You have made more initiatives than other users.
Using the current high bid price of 0,02 Hive and your example a free user can send a mail once per 7 days and earn 150 ListNerds. That is EARNING 3 HIVE per week for promoting their blog/community/business or whatever.. 12 HIVE per month.
Im just surprised more users aren't all over this..