$2k for 15000 users. <wrong>Each user is worth $7.50/month to you. But, they only pay once to sign up.</wrong> Each user is worth 13 cents.

So, it seems that the users paying for the archival service($25/yr) are the one's keeping the lights on at your bookmarking service. 1000 such users would bring in $25K. Basically you need 7% of your users(15000) to break even today.

Each user is worth $2000/15000 ~= 13 cents

My Question:

1. Is it easy to get recurring paying users?

2. In the long run(for any paying web service) what % of the user base do you think will be such users ? [Is 20% the max ? or 30 % ?]

EDIT: Fixed my cost per user