I am also not especially surprised by the proliferation of Streak LRMs, although that is honestly not a technology that I am terribly impressed with. Sure conserving ammo is nice, but they weigh so much more than standards that you do not really gain anything from the change in combat and the extra cost of the ammo means they are not really any easier on the logistics end either.
I think your analysis is a bit off. on the logistics side. Higher cost per unit doesn't necessarily equal bad. Frex. Right now it costs somewhere north of $400 USD to get a gallon of diesel fuel to a FOB in Afghanistan. Keep in mind that less than 2% of that costs is the gallon of diesel, and the rest is shipping costs.
If tomorrow someone were to come up with a "Super" diesel that functioned ideitcally to diesel except that it gave you 5 times more mpg/run time than standard diesel, but at ten times the cost, the military would be all over it. It would allow them to ship the equivalent of a frex. 100 gallons of deisel for around 25% of the cost of what they are paying now.
Streak LRM's function in similary way since log chains in BT are so ardous and constrained. They are trading a high per unit cost for the abilityto simplfy your log issues not just on the shipping side but also the strain placed on your ammo reloading resources as well.
Now in fairness, it gains that by a pretty steep cost to a combat units throw weight. Whether that is justified or not depends on the doctrine of the force fielding them and on the realities of the battlefield they will fight on. Frex. I could see them more relaistically on a company or Batt-sized roving "troubleshooter" or raider unit but not so much on a RCT-sized formation that's used to fighting pitched battles with the majority of its assets (inlcuding its vast number of log units) present or say the garrison statioend to provide close-in defense to an LRM plant.
-Jackmc