well maybe you aren't now, but you were when you took 6 hpurs income for 2 creds... It shouldn't be other way.... Look how many credits does it cost for you to take extra income now - 6 or 10 creds? If you're under 20th it should cost you 10 creds and give 10 hours income...
6 hr income for 2 credits if in top 20 - I dont think so... I had received 6 hour production for 2 credits several times and Im pretty sure Im not in the top 20.. I did noticed though that when you failed to get the 6hr production for 2 credits after 24 hours, the bonus becomes 10hr production for 10 credits..