It’s time to change my mind about ads pause the AdBlocker and see what will happen

Have you tried asking for donations? If people value your site enough, users are usually willing to lend a hand. I've seen plenty of donation-driven sites and they often meet their targets, if the content the site produces is valuable enough. Especially for smaller or community-driven sites. I'm not sure if you have enough loyal users to make this a feasible option though.

With your current numbers you're looking to make maybe $10/month from advertisements? If that. While that is certainly a good chunk of that $80/mo, the size of your site might be better suited for a free host [0] than AWS.

ps: Getting rid of the height from .info-banner seems to fix this issue ; tested in FF and Chrome: http://i.imgur.com/yrFtN7P.png

[0] I've yet to find a free host that beats http://www.heliohost.org/home/