We get millions of pageviews on SteamDB and steamstat.us every month, so hosting and developing stuff does require some money. As long as the donations cover our development and hosting costs we won't have to put ads on our sites. This makes your life (and ours) less painful.
When logged in and after donating a minimum of one euro, you will receive a special "donator" badge which will be visible throughout the site.
You should only donate if you expect nothing in return.
Instead of donating via PayPal, you can also gift our bot a Steam key which also helps the service.