Per user costs for a website is on the number of pennies a month and most of that is for electricity.

I can plug in a $750 second-hand server with a xeon processor, 40 TB of storage and 128gb of ram and easily serve all of the needs of several thousand users on essentially any website type for $1.50 a day.

Sure, if you throw in video and a lot of bandwidth then the number would go up, but for pictures and text and website interaction on the par of bluesky or twitter or mbin sans hosted video it would work very well.

If I reached the point where I needed to expand for the raw processing I can just throw another $1,000 and $45/month in electricity at it and double how much I can handle.

Computers are stupid cheap. Internet services are stupid cheap. Asking for more than a dollar a person per month for anything that doesn’t have licensing fees on it (like tv/movies) or very high bandwidth usage (like YouTube) is a greedy rip off.

That being said, at those prices I would not make anything for running the service, and that also would not cover additional development costs for any new features that needed to be added, but even so, unless your goal is to disenfranchise users you should not charge more than a buck a month or hell, $10 a year per person for all of their access to your service.