In reply to Steve Truman.

I am sorry, but I didn't get the memo.... why no one had told me that (on the site I am finishing right now) I **have** to upgrade **ASAP**.

As you said we are not talking about blogs, we are talking about people's livelihood, so how reckless can shop owners be? Can you imagine a real world shop replacing its POS/credit card processing/whatever other essential utility with a new thing without testing it before throwing away the old one?

Reckless people that do not do minimal common sense steps to avoid potential loss, rarely can sue for anything. They will need to prove that the WC EULA promised them that there are no bugs and it will work well with their specific sites to prove that they had a contractual reason to expect things to work, before any lawyer will be willing to waste his time to look into representing them.