the main problem is that in the market the current situation is not 1 new customer a day but 1 new customer in a week "in the best of cases 2 new customer".. that way after one year at $3 a month will be able to make only "$144" max "$288" and this prevision is always if all customers will not abandon their projects, because perhaps many users in meanwhile switch to other cms or decide to stop their projects with Boonex, this can not finance an adequate support only see more a one-time payment may give finance to upgrade and support user in a market with this volume, regarding Wordpress also if will have a subscription system, I still have to see a plugin that uses this system, "perhaps 1%" i think 99% use one-time payment and the Wordpress market go very well so I do not think that the problem of Boonex is the method of payment.