1. It requires PHP 5.3 and I don’t have that
Well this one is a no-go unfortunately. Just upgrade, or change provider or use a different plugin ;).
2. Does this plugin help me earn revenue?
Due to popular demand, we are excited to announce that we have now added a new layer onto the ReadyGraph product: monetization. For quality sites with enough users and traffic to qualify, we will enable you to earn revenue through a set of elegant, unobtrusive sponsorship units.The ad units will be shown occasionally (much of the time they won’t be noticeable) and are highly targeted based on user interests. Most importantly, they can be turned off or on at any time. In addition to helping qualifying sites support themselves, this initiative will allow us to continue to put resources towards enhancing the free features we offer each and every site owner. Sites qualify on the basis of quality and a minimum traffic threshold. You can view, adjust, or opt out through your site monetization settings page.
3. It doesn’t work they way I wanted it to
Yes, in that case just deactivate and uninstall the plugin.