That might be one reason for unrealistic reporting of earnings. Uber always gives potential hourly earnings before expenses and before they take their cut. Potential hourly earnings are often based on very casual work only possible to achieve through strict cherry picking.
Just do your best and work it as long as you can… What you are experiencing is pretty much the reality of what taxi drivers fear and oppose in Uber. My understanding as a taxi driver, my fear is that when the day comes that I don’t make any money driving taxi, well, Uber drivers wont be making any money either.