I'm going through GoogleCash right now (again) and have found that affiliate program aggregator LinkShare where reporting is not real-time, but delayed 24 hours doesn't really work that well with my natural tendencies to follow things closely.
I can blow $5 one day, with high clickthroughs, only to find out the day after that none of the visitors converted into sales, and that I should have stopped the campaign sooner
And at the other end I can spend $5 one day, with high clickthroughs, only to find out the next day that ALL my visitors converted into sales and that could have easily spent $10 or $15
I have a CTR of 9,4% on my second campaign, but I have to wait until tomorrow to see if any visitors converted into sales
It's a whole 'nother story with CJ which report sales immediately