Hangar 8 seem to be happy to go on record as doing it:
Iceland volcano ash cloud flight risk 'blown out of proportion' airline claims | Metro.co.uk
For us it's just proving impossible to ensure continued airworthiness of our aircraft, which is after all the operator's responsibility - the only way we can ensure it is to boroscope after every single flight which would obviously be a logistical nightmare as well as totally impractical. Plus the fact that engine programs aren't going to cover any damage caused by volcanic ash makes it seem difficult to justify both on safety grounds and on commercial ones too.
Add to that the insurers, if God-forbid something happened, would I'm sure be happy to have a discussion in court over the merits of flying when all the airlines (we hold the same licence after all) are grounded and all the advice is to not fly.
Whether it's all been an overreaction is another argument though, but liability-wise, to me at least, it's clear that we shouldn't be flying.