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15 GB of bandwidth in 10 days is very little. You could optimize your images by compressing them. You could check http://imageoptimizer.net/
 
Also you can try using CloudFlare (www.cloudflare.com) to save your bandwidth.

Revive Adserver does not run the maintenance in real-time, as it would result in a huge performance impact. It runs it on the scheduled maintenance you set. Make sure you either have the maintenance inside Revive enabled or have a cron job setup with the maintenance.

Before running the installation make sure that your /var folder has the correct permission (755 while in suPHP and 777 while in DSO). After installation is completed, change the permission back to default. Also make sure that you have the correct ownership and group permission assigned to the /var directory.

http:// and https:// are the same thing, except when a user accesses your site via https:// the data they enter into form fields such as username and password is encrypted/secured.

You will have to make sure that you place the ad code only on the homepage of your Joomla and not on the header or footer.

Yes, you can delete the cache files and new cache files will continue to generate. 2 GB of space is very low. You may want to consider increasing your hosting disk space slightly.

With DPF Small Business you can only server up to 90 million impressions per month, which isn't that much. When you want to serve more than 90 million impressions per month, you'll have to contact Google and upgrade to the DPF Premium, which will quickly increase your costs more than the cost of hosting your own Revive platform. Also you can't customize DPF.

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You should definitely be able to serve way more than 200 million impressions from a single server. 200 impressions per month equals to only about 250,000 impressions per hour, which is pretty low. We have customers that serve over 1 million impressions per hour on one of our dedicated servers.

You are most likely not able to serve more impressions currently due to non optimized server for Revive, not enough server power, and possibly non optimized script as you mentioned you may need an upgrade.

Have you tried Mod Security Commercial Rules (Web Application Firewall) or CloudFlare Web Application Firewall?

Mod Security and CloudFlare are both part of OWASP (www.owasp.org/index.php/Category:OWASP_ModSecurity_Core_Rule_Set_Project) which provide the same set of rules.

Mod Security is free, but the commercial rules I think are a one time fee of $500, while with CloudFlare (www.cloudflare.com/waf) you have to pay $200 every month.

This is probably the best and most affordable way for blocking bots and bad traffic.

Another solution is to get a hardware firewall in front of your server to filter out the bad traffic, but that may be more expensive.

Make sure you have created a MySQL database inside your server. You will then need to assign permission to the database, so MySQL database and user cam connect. Once that is done, input the database info over to Revive and you're all set.