For those who love stats and numbers, we have good news.
Just launched is our new feature which makes it possible to track the profit of objects (like casinos and bullet factories), together with any changes happening to them.
Since this involves storing a lot of data, the data is only kept for 48 hours and gets deleted after.

Thanks to the people who suggested this.

Links:
DM http://dm.trabot.net/objectprofits.php
COM http://com.trabot.net/objectprofits.php