It's a great opportunity with a low cost of entry. I'd say it's a good hustle for a side job but I wouldn't quit my job even if I was making twice as much money on Amazon Merch. You are basing your business on their platform and they can drop you at any time. And they do. All the time.

Now if you use it as one form of income and have a couple others like Steemit, YouTube, etc. then yeah, leave your 9-5. Either way, I'd apply because it takes anywhere from 3 weeks to 8 months to get accepted into the program. Good luck.