I should warn everybody about SlicethePie. I have been a member of slicethepie for about three or four months, and while everything was going great, they are quick to lock your account for any type of reason, even when you are not breaking the terms and conditions. I made sure each and every time I used that website that I was not breaking their terms and conditions, and my account still got locked. So I would just watch out for that. That is just my personal experience with the website though. It may be different for other people.
First dollar insurance plans have higher premiums because the insurer is bearing a greater risk for the insured item. For example, with a first dollar health insurance plan, the insurance company will charge the customer higher premiums since the insurer begins payment with the first covered service the patient receives. First dollar coverage tends to be less prevalent in the home and car insurance industry because of the higher premiums.
People are turning to audio and visuals when it comes to technical subjects. However, you should consider doing an ebook first and turning it into an audiobook through a resource like Audible's ACX platform. You can hire a producer either through a royalty share program, so you don't have to shell out upfront cash, or you can do a pay-per-hour hire as well.