Dennis Dinkel, Sergio Avedian
- Dennis Dinkel, 75, drove for Uber and Lyft for four years in California and Arkansas.
- He said that tipping was hit or miss and that most riders didn't tip at all.
- Drivers told Insider riders should tip and that Uber was partly to blame for low tips.
Dennis Dinkel hoped the gig economy would help him supplement his Social Security income. But the 75-year-old said the tips — or the lack thereof — were disappointing.