IMO your idea is something what must happen in Montenegro considering Real Estate.
There is more than 500 agencies and 10 times more people trying sell some land, apartments, houses.. but there is no bread for all. Drivers will be back to their truck, waiters in restaurants... (without diminishing their profession however).
By experience of other transition countries like Lithuania, here will stay maybe 20 % of agencies and only few of them will do good work.

There is already lot of agencies work together in a way that if they have demand for let say, big peace of land and do not have in offer, they call people who they know, and that people acting as intermediaries and adding on price some amount.
I recently had funny situation, my client was in demand for big land for hotel more than 20000 sqm, so he has made one circle around through agents and come back with price higher for 60 euro per sq m for same land, and for 20000 sqm is pretty big difference...

Moreover, RE/MAX is starting doing business in Montenegro and they will bring just new standard of trade here, to which we will have to adopt if we want to survive in this business. I think any serious investor when comes to Montenegro will consider Remax at least for opinion.

just some thoughts

MLS