It's not a good money earning opportunity. Here are the reasons.
1. They would charge you 14$ upfront
2. They would charge you 9.99$ every month
3. You would get around 10.5$ every month
4. So, after charging the membership fee, it's only 1.5$ per month net earning
So if you are willing to cover your rear window for 1.5$ per month, while taking the hassle of taking the picture by abiding by all the strict rules, and actually ready to pay some non-refundable upfront... well, you are in luck