Recently I looked at the stats and bonuses that Tank Commanders provide and this is what I found:
When a TC gets into a vehicle there are these modifiers:
Sight +15
Weapon reload time x0.85 (Reloads 15% faster)
Weapon accuracy: x1.25 (+25% accuracy)
Rec. accuracy: x0.85 (15% harder to hit)
Rec. damage: x0.85 (takes 15% less damage)
Given the way the modifier is applied I am not sure if these apply on the TC or the vehicle he is in. I think it applies to the TC so the only benefit is the sight bonus because the rest makes no difference on TC's weapon when he is inside a vehicle. On the other hand why would the other modifiers be there if they do nothing? Well, anyway...
At vet level 1:
Weapon accuracy: x1.15
Rec. accuracy: x0.9
Weapon penetration: x1.1
Vet2:
Weapon accuracy: x1.25
Rec. accuracy: x0.8
Weapon penetration: x1.2
Vet3:
Weapon accuracy: x1.35
Rec. accuracy: x0.7
Weapon penetration: x1.3
The bonuses from each level stack so cumulative bonus at Vet3 is:
accuracy x1.94 (2.425) = accuracy +94% (+242.5%)
rec. accuracy x0.504 (0.4284) = harder to hit by 49.6% (57.16%)
penetration x1.716 = penetration chance +71.6%
(weapon reload time x0.85)
(rec. damage: x0.85)
- values in parentheses apply in case that the "level 0" stats apply on the vehicle too
From my perspective most of the bonuses make little sense. TC cannot make a tank as big as KT harder to hit, cannot miraculously icrease penetration etc.
Also the accuracy bonus is so high, that it makes the tank never miss other vehicles unless those have some accuracy nerfing modifiers on them (e.g. smoke and/or some vehicle-specific modifier). Also is something is meant to be easily hit, guns usually have accuracy bonus against it (e.g. big tanks such as KT, JT are easier to hit by most weapons) or if they are meant to be harder to hit, the same applies (e.g. Cromwells or JPIV) and the bonuses from TCskinda negate these downsides/upsides the tanks were meant to have.
And the penetration bonus is actually stronger than what AP ammo provides - so technically with TC in a tank you never need to use AP rounds at all, or you can use it in tanks such as Shermans to penetrate targets they should not be able to penetrate (TC penetration bonus stacks with AP bonus).
So I was thinking that the tank commanders could be done differently - similar to how light vehicle veterancy works. Something like this:
Vet0:
Sight +15
Vet1:
Weapon reload time x0.85
Vet2:
Weapon accuracy: x1.25
Vet3:
Rec. damage: x0.85
This way each vet level would provide a buff in a certain area - faster reloading, better accuracy, taking less damage. Bonuses are significant enough to make a difference but they don't provide over the top bonuses. Of course this would make the TCs way less effective than they are now (though still buffing the vehicle by significant amount) so their price could be dropped from 340MP to...I don't know...220MP?
So what do you think? Should Tank Commanders stay as they are or should we bring them more to the mortal realm?
But the way how you suggest it, seems pretty fine as well... However, price reduction to 240 MP is more than enough! 
