Your idea is very interesting. But I think your project will not succeed because there are lots of real quests for which you can make a profit. In your case, the profit is minimal and much more costs. Need to move in the other city + need pay quest. I think it's very expensive.
The project is aimed at the tourism sector, people travel regardless of the project. He is like helping those who are tired of dull and monotonous excursions with guides.
In which countries your project is going to provide its services in the first place?