Tritium spots need to be set to be uncommon to rare but the drop rates IN the hotspots to very high. The idea that looking for the hotspot should be a time investment, then once found you have a "gas station" and can go in and fill your cargo in a decent to fast time.
Doing this, people will of course create a hotspot map, which in turn will construct a network, routes and so forth. and distances will be considered in terms of where the known hotspots are. So going off the main routes will be seen as "being in the wilds" while being near or on the routes is seen as "on the highway."
Obviously discovering a hotspot, not on the map presents the player with a unique opportunity, they could use it for themselves or their player alliance, thus providing a strategic point. Or trade the location for credits OR decide strengthen the network as a whole and just add it to the map.
The more hotspots that are discovered and mapped, the stronger the network as a whole.