Adsense works the best when it comes to advertising.
I would have to disagree about working best maybe it pays out the most sometimes. Google Adsense has a algorithm that searches for a 3% or more increase in account ad clicks per month. If you are a small website or business, and Google notices a 3% or more increase in your sites ad clicks you will receive a email like this:
his message was sent from a notification-only email address that does not
accept incoming email. Please do not reply to this message.
---------------------------------------------------------------
Hello,
After reviewing our records, we've determined that your AdSense account
poses a risk of generating invalid activity. Because we have a
responsibility to protect our AdWords advertisers from inflated costs due
to invalid activity, we've found it necessary to disable your AdSense
account. Your outstanding balance and Google's share of the revenue will
both be fully refunded back to the affected advertisers.
Please understand that we need to take such steps to maintain the
effectiveness of Google's advertising system, particularly the
advertiser-publisher relationship. We understand the inconvenience that
this may cause you, and we thank you in advance for your understanding and
cooperation.
If you have any questions or concerns about the actions we've taken, how
you can appeal this decision, or invalid activity in general, you can find
more information by visiting
http://www.google.com/adsense/support/bin/answer.py?answer=57153.
Sincerely,
The Google AdSense Team
Then if you appeal there decision even if you can prove you did nothing wrong they will send you a email like this:
ello,
Thank you for your appeal. We appreciate the additional information you've
provided, as well as your continued interest in the AdSense program.
However, after thoroughly re-reviewing your account data and taking your
feedback into consideration, our specialists have confirmed that we're
unable to reinstate your AdSense account.
As a reminder, if you have any questions or concerns about your account,
the actions we've taken, or invalid activity in general, you can find more
information by visiting
http://www.google.com/adsense/support/bin/answer.py?answer=57153.
Sincerely,
The Google AdSense Team
Then they will keep all the money in your Google Adsense account, and banned your email address so they don't have to ever deal with you again.
If you want to use the banner factory model for making money I would strongly suggest using an alternative to Google Adsense. It might not pay out as much but you will at least get paid.
Another way people are making money from there games is buy selling virtual goods in game. Zynga uses this method on facebook, and out did EA Games in yearly sales last year.