Apple is staying quiet on why it refuses to accept cash payments for iPads, says San Francisco's KGO. The TV station notes that a local disabled woman, Diane Campbell, decided to make an iPad her first computer so she could advance her guitar playing. After saving small amounts of cash over several months, she eventually accumulated the $600 she needed to buy a 16GB Wi-Fi model. When she tried to pay for one at the Palo Alto Apple Store, however, she was rejected.