Hi George,
You’re absolutely right that marketing the thing is key. But being at the starting line sure makes it easier to start the race than sitting on the sidelines dreaming about running.
I most prefer marketing a thing before the product is complete, so you’re developing it as customers are paying. Being pre-sold, you know it’s an idea that will sell.
However, we’re talking here about a simple $27-47 product, or maybe a $27/mo program, which is what I started with. Not so much effort to create, and it’s a delight and relief to have something to offer when you speak or put up a website.