[tchock23]

I used to think this was bad advice (hiring out to others to vet your idea) and would actively advise startups against it, but the more I work with entrepreneurs the more I'm coming around to the view that this is a good route to take for someone who is working full-time and considering jumping off to do their startup.

By hiring out to vet the idea it reduces the confirmation bias that entrepreneurs face when researching their own ideas. As you noted, it forces an upfront financial commitment on the part of the entrepreneur, helping them realize what it will take to properly fund a startup at scale. It's also a time saver - trying to talk to potential customers (particularly for B2B startups) while holding down a full-time job is very difficult.

Of course, the entrepreneur should still be involved to the greatest extent possible, otherwise any early learning from the customer conversations, MVPs, etc. is lost...