Easy: barber shops review. Ratings of haircuts, shop look & feel, barbers, etc... A yelp devoted only to barber shops, for guys only! No girls allowed :P Users can review and give suggestions, just like a normal review website.
- Easy to be monetized with paid reviews or sponsored content
- Hipsters are welcome and willing to spend their money/time!
- Barbershops are everywhere!
- Easy MVP. A WordPress is enough to start the website
- The review-website mechanism is proved to work, almost in every niche
- How to get a bunch of content for the start? You can't start with an empty website
- You need moderation once it gets traction
- Users are not willing to change barbers often. I was with the same barber for 30 years. So they would not search for reviews or a hint to change their habits
- A relative small niche
- Too much competition in review-based websites
Check https://github.com/napolux/1000ideas for license and FAQ