They're supposed to be easily massable. And consider this: he spent the following to get those Tier 3 Roaches:They are easily massable so they should cost a little more.
Roach Warren: 150 minerals.
Burrow: 50/50
Burrowed Movement: 150/150
Fast Movement: 100/100
Fast Regen: 150/150
This doesn't include the Infestation Pit he never used and the Hive upgrade. That's a lot of money to be sinking into a unit; it had better pay off.
Also, Roaches need to be available in number in the early game, so making them too expensive just isn't practical.
I think the beauty of Roaches is that their range ultimately limits the utility of massing them. Hydralisks can attack at reasonably long range, so getting a large ball of them still allows the ones in the back to attack the melee units in front. Roaches have much shorter range, so fewer of them can attack simultaneously.
Mass Roaches works to a point, and then stops getting better. It's a hard limit on critical mass.
BTW, do you have links to those games?




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