Increasing the marginal cost discourages adding users. You punish people for having a lot of users, which creates a pain point, which creates an exploitable opp

Increasing the marginal cost discourages adding users. You punish people for having a lot of users, which creates a pain point, which creates an exploitable opportunity for your competition. Better to charge a flat rate per user, or follow the 37 Signals example and not charge per user at all. http://www.inc.com/magazine/201206/jason-fried/huge-accounts-make-me-nervous-it-takes-a-village.html http://www.inc.com/magazine/201206/jason-fried/huge-accounts...