^ Didn't the high cost of the cowl come from the fact that they had to place a huge bulk order overseas on the custom design (something like 10,000 units) so that it wouldn't look suspicious (and instead would look like they were being bought for Halloween or theater costumes, I assume), and then buy a completely new bulk order because the first graphite cowls broke easily? Alfred and Bruce talked about it in Batman Begins
. Or maybe they never replaced them since Bane broke the cowl with his fists.
I think it and the cost of the nomex survival suit are the two things we actually get cost estimates on in the film itself. Something like "bean counters didn't think a soldiers life was worth $300,000(?)" in the case of the body armor. So, I think they mistook $300,000 for $3,000.
-Bruce is surprised that a fusion reactor can be weaponized? And only one scientist in the world (who even published his findings!) can do this?
Actually, if anything happens to a fusion reactor, it just stops working. No meltdown, no explosion. Some of the peripheral machinery or coolants used to generate the reaction can fail and technically "explode," but these would be on the level of relatively minor industrial accidents and not a nuclear explosion.