I've seen plenty of projects that are rife with anti-patterns because a team was unfamiliar with a problem or technology and made a bunch of bad decisions while they were still coming up to speed.
The use-case I envision would fix this. Because it's really a travesty that when we're the least familiar with technologies is when we make some of the most important architectural decisions. And these mistakes could be avoided with questions like "What issues will we run into?" "What patterns should we follow?" "What are good resources to get started?"
For instance I recently joined a project that was built by devs coming up to speed on React. And boy did they abuse Flux, they didn't build a store for every drop-down but it's pretty damn close. However I really think a React Guru could have steered them around this mistake with just 30 minutes of his time.
Obviously the biggest problem is ensuring quality without having to hike rates too much.