Seems I stirred a bit of controversy with my question, so I think it is only fair that I offer my input as a paying customer.
I am 100% comfortable paying a guide without a guarantee of a refund nor would I expect one if the trip were cancelled due to weather...even if it were at the trailhead. Climbing is condition dependent. That is part of the game as with most outdoor activites we all enjoy. You cannot expect the guide or the guide service to not reasonably try to get their clients to the summit...if there is a chance it can be done safely.
However, what I would expect is their best assessment of the conditions on the mountain and their judgement as to what to do in any situation given the conditions. Thus, my reason for the question I posted. I read the climbing reports last week and all indicated "dangerously unstable conditions for climbers on the area peaks". That data was easy to find. So, If it had been a guided group ascending above Muir in those conditions, I would have been highly suspect of that guide service.
If I fly to Seattle and encounter those conditions and read similar reports, I would expect my guide service to provide me with their best assessment based on the info available. I do, however, think it is prudent of me to know the reports as well so I can question the guide specifically about them.
If guide service thinks it would be absolutley safe to get to Muir or aany other location, enjoy the experience, practice some skills, BUT not get to summit...I would be ok with that. Sure it would be disappointing since I planned a trip a year in advance, but it is out of everyone's control....so why do I get a refund?