Looking forward to hearing the features the "database plan at or near this price point" will have. We would love to be able to connect to our database with other apps besides the main one - even if it ended up somewhere between the $200/month plan and the $15/month - it would be incredibly useful.
Thanks for the feature request. Attaching multiple apps to one DB is something we've wanted to do for quite a while...
FYI, you can hack this by provisioning a database on one app, then manually setting the DATABASE_URL config var on a second app to match that of the first app.