I didn't realize that not answering emails would reduce your credibility (I thought the -# was showing how much you'd lose if you failed). I got three 4and5-star emails when my communications was only level 3, so I ignored them. They all ended at the same time and decimated my credibility. I had another 5-star email waiting that ended the next day, but I didn't have enough money to buy anything to increase my communications, so I was pretty much done -.-
Besides that, I enjoyed myself :P