Huh. Didn't know people used it for the real purpose. I thought everyone just cashed them used them to pay CC and write checks from regular bank. go figure.
I have been of the mind that it's "safer" (less likely to raise BB or CC eyebrows) to pay a non-CC bill than a CC bill with BB. The BB wiki implies that:
"On the BB site, money can be sent to pay bills that don't normally accept CCs (think rent/mortgage, tuition, insurance, car payment, gas bill, even pay your cc bill) or to anyone in the U.S. for free. Use the 'pay and transfer tab'. Checks sent online this way are delivered within 5 business days. (It may be prudent not to use BB to directly pay the CC on which you purchased the VRs/GCs that funded BB, but, once again, YMMV.)"