oh yeah, and that dates back 3 months of my activity too... so if you calculate on each user costing about 20mb/month of data you are looking at a pretty low cost to host 400 of them, i pay about 5 euros a month for a VPS that would handle that
i haven't worked out the payment system yet... currently working on a chat-bot based control system for admins and owners and i think it probably won't be much to add an interface in there to allow subscriptions, maybe a couple of weeks i'll have most of this implemented