I do agree, however Im one of the guilty ones where I did pull out - but I did let the guys know and had other stuff come up that to me, was alot more important and needed to be sorted out.
I doubt they'll lose money as their days always sell out - hell, even at the last OP day where it rained for 99.8% of the time it was a busy day!
I'll hopefully be at the next one and I try and always support autosports where possible.