I was rather surprised, Bucket, when my multiple and very expensive insurances stopped paying out. Upon reading the necessary paragraphs of small print I found my insurers were, indeed, entitled to stop paying after 18 months or two years (the mortgage cover turned out to be one year). Also that my second-to-top-level BUPA limited the number of claims payable which, once the ceiling was reached, entitled the insurer to reassess my policy as a new application - excluding my ongoing conditions from cover.
I had thought that throwing money at potential crises would cushion me from disaster. It did, but the cushion was only good for slowing the decline: it was more of a leaky air mattress than a trampoline.
I never had such an arrogant attitude as yours, but was still shocked to find myself unable to prevent a violent change of circumstances. It will be interesting to see what happens if you have to discover you're more dependent on good luck than foresight.