...
$5 per month for every 1000 bot user (total bot user below 5000);
$5 $20 per month for every 5000 bot users (if total bot user above 5000)
...
$5 per month for every 1000 bot user (total bot user below 5000);
$5 $20 per month for every 5000 bot users (if total bot user above 5000)