In early 2001, I booked 2 very inexpensive PL tickets that both cost me only $100 total. (LAX-SFO & LAX-PHX) On the LAX-SFO, they were oversold, I volunteered but didn't need me. I received a CS50 from UA. On the other ticket, they needed volunteers on the PHX-LAX return. I received $600 in UA vouchers (4 x $150 book). After that trip, I found FT & ended up getting 4 trips on UA with those vouchers (thanks to mileage run threads!) & getting double miles with these revenue tickets. (due to Prem Ex status on UA).

I didn't care about not getting miles on the PL tickets. I didn't bother to ask for mileage because I wasn't entitled to getting mileage.