There's not really a land grab, and you better be sure to have propulsion on board in the coming years, as youll most likely have to evade other defunct satellites.
The ISS is actually in a bad position, as satellites tend to go to earth, and the ISS is between earth and most LEO sats (400km vs 600-800km).
The ISS is in a great position, because it's in an altitude with such high drag that small objects and uncontrolled fragments deorbit very quickly. Even the ISS loses 50 - 90 m of altitude a day.
Satellites passing through the ISS's orbit do not tend to spend that many orbits there.
The ISS is actually in a bad position, as satellites tend to go to earth, and the ISS is between earth and most LEO sats (400km vs 600-800km).