Not quite exactly about "lucrative yet monotonous", but The War of Art is definitely an extended meditation on "putting in the elbow grease". It's not a manual of techniques about how to get things done, but it is inspirational for getting out of your own way, shutting up, sitting down, and writing.

It's written by someone who mostly writes movies, but it applies to anyone who does anything remotely creative, where your project has a lot of uncertainty and many opportunities to stall or talk yourself into giving up.

Highly recommended.