What should an individual earn for advertising for a company?

Recently my vehicle was in an auto accident. After the repairs were completed, I sent a great big thank you to my insurance company for the awesome job they did handling my claim. I was asked to participate in a training video for my insurance company and relate my experience, I was paid $150 to do this, which I gladly did. I have been recontacted by my insurance company, they now want me to release all rights of the training video so that they can have unlimited use in/on: their website, tv commercials, banners, brochures, etc... What would I charge them for the unlimited use of this video? They indicated that it was very powerful in their internal training and now want to put it on their web page for viewing.