Yes, agreed... Workman's comp doesn't cover us - since we are not employees. The only exception would be Nevada of course. But, as a self-employed business, we can purchase our own "workers comp" insurance - which would cover us in these sorts of situations.
I personally will not be pursuing this legally, I am feeling better (though acknowledging that I have been given some good pain killers, so there is that...) but more importantly, this is not a severe enough injury that would be worth potential fall out with the client (it's a pretty major client for me - I do a number of shops for them per year). That is situational though - if it was a more significant injury or one that I was not going to fully recover from, or a less significant client - I might feel different.
Since I have some time (sitting waiting for the next doctor to come in) I took what was so helpfully suggested and queried a friend of mine that owns a MSC (not the MSC that I was doing the shop for) and she agreed that it is between the me as a "guest" and the business, though as a MSC owner she said she would absolutely want to know as soon as someone decided to take legal action and that she would understand the decision to pursue, but would like to be aware as obviously the report is going to be an issue when it is turned in.
Anyway - thanks everyone for the well wishes. I think it is an interesting discussion. The other factor one could consider is if the client is the actual person liable for the injury, or if that is a third party. I am actually not sure about this in this particular case - but many times the shop may be for the hotel brand, but the injury is caused by the owner/operator of the property which is often a franchise owner. In that case, there would seem to be no issue with going after the owner of the property.