I just joined AWS to move some domains over from another host, specifically one site I'm trying to turn into a startup. I set up RDS thinking that "pay what you use" would mean I would have no bill since the site has no traffic yet. Turns out spinning up an idle "production" RDS instance costs $800/mo which I just found out when receiving my first month's bill. I emailed support but no answer yet. I still plan to use AWS and offsetting this bullshit with credits would be nice.