First off doesn't the U-Pass have a face picture on it? I don't have one so I'm not sure. But if it does what good is it to try and sell it.
As for the numbers hmm 8,000 an hour. So is that on average or just during the peak. If we assume it is average than based on 21 hours of operation that equates to 168,000 per day
Now if we assume that 8,000 is the peak. it is harder to figure out the daily usage. But lets assume that we can maintain that for 12 hours namely 7am -7pm that means the daily ridership is 96,000.