I would let Haken keep my thirty bucks if I had a ticket for a cancelled show of theirs. These times are hard for smaller, independent bands like them, I think. But those thirty bucks wouldn't kill me, and if more people would do that, it would make life much easier for Haken. I wouldn't do the same for bigger bands like Tool or so, but artists like Big Big Train (or iamthemorning or IQ...) don't make that much money from their great music in the first place. And having organize and plan a whole tour, pay for the whole thing and THEN having to refund all the paid ticket money... that can't be easy for them.