So, I'm not a supporter of the Droneport, but there has been a lot of talk about Markerlights recently, especially with how to avoid getting your Markerlights alphastruck off the field.
By and large, it seems that people are devoting about 10% of their lists to Markerlight firepower. So, let's make some theoretical Markerlight groupings and see how they perform in two categories Markerlight efficiency and durability.

Group #1: Standard Markerlight Group
Fast Attack  6x Pathfinders w/ 3x Ion Rifles, 3x Markerlights (60)
Fast Attack  6x Pathfinders w/ 6x Markerlights (48)
Fast Attack  6x Pathfinders w/ 6x Markerlights (48)
Total: 156

Group #2: Marksman Droneport
Elites  Firesight Marksman w/ Markerlight (24)
Fast Attack  9x Pathfinders w/ 9x Markerlights (72)
Fortification  Tidewall Droneport w/ 4x Marker Drones (120)
Total: 216

Group #3: Fireblade Droneport
HQ  Cadre Fireblade w/ Markerlight (42)
Fast Attack  9x Pathfinders w/ 9x Markerlights (72)
Fortification  Tidewall Droneport w/ 4x Marker Drones (120)
Total: 234

Output:
1. Avg. 7.5 hits, 3 Ion hits
2. Avg. 7.9 hits
3. Avg. 8.7 hits
Efficiency:
1. 20.8pts/hit
2. 27. 3pts/hit
3. 26.9pts/hit

Now, let's multiply the number of hits in Group #2 by the optimal efficinecy of the Pathfinders, and subtract that sum from the points cost of the units themselves. This will give us a "durability" rating.
Durability:
2. 51.7pts
3. 53.1pts
So, for Group #2, you're essentially paying 52 points to make our 78 Markerlight hits more durable. For Group #3, you're paying 53 points. Seems like these groups are just about equal in terms of efficiency! Let's see what we get:

Group #1: Standard Markerlight Group
18 T3/Sv5+ wounds
Group #2: Marksman Droneport
10 T7/Sv4+ wounds (remember the Drones are destroyed if the Droneport is)
3 T3/Sv4+ wounds
9 T3/Sv5+ wounds
Group #3: Fireblade Droneport
10 T7/Sv4+ wounds (remember the Drones are destroyed if the Droneport is)
5 T3/Sv4+ wounds
9 T3/Sv5+ wounds

In all honesty, is that extra durability is worth 52 or 53 points to you, the Droneport might not be such a bad idea after all.