I understand that. When I started writing my book I got an editor pretty quickly because I knew that it would be way to much work to do it all at once. I also looked through the doc (which took forever to access which is why the incentive should be part of the actual post) but I felt a little overwhelmed. I didn't even look at the incentive because it felt like too much.
If the incentive is mentioned in the post so people see it before they read they will go in with a positive attitude and are more likely to work with you. But when they go in with a neutral attitude because they don't know the incentive they might feel it is too much work and when they get to the incentive they lose interest, and that is even if they get all the way through.
It's a great story but they way the request was structured didn't really do a good job of encouraging people to work with you.