I'm not sure how you got to the sight and rocket correlation.
The Alcotan's integrated targeting system (VOSEL M2) is like an optional sight, it's attachable and removable with each Alcotan munition (i.e. rocket + launcher). Once the munition is used, it is discarded and the same sight (VOSEL M2) is removed and used with the next rocket. The sight is an independent entity; if the Army chose the Saab Carl Gustaf M4 (assuming Sweden is willing it), it would need a sight for that too.
Sight and rocket correlation:
Assume, for the sake of argument, missile's cost is x and sight's cost is 10x. Then,
158 * 10x + 1413 * x = 24.755 M
=> x = 8270.96 = cost of 1 missile
10 x = 82709.65 = cost of 1 sight.
If you say the missile is cheaper than that, then the cost of the sight only increases. You can buy as many missiles as you want, but in the end, you would need to buy the sights as well for all infantry units. But the thing is, you do not spread around such expensive equipment to grunts in trenches across the army.
Also, for all that money, you are getting something that is incapable of acquiring a target lock. It is an unguided missile. At the minimal, the missile should have heat seeker, and the sight should have aA laser designator. I am not very good with what other options are out there, but surely, there is some shoulder fired system out there that:
1. Is day/night all weather capable.
2. Acquires an initial lock on the target using heat signature or laser designator.
3. Passes the information to fire and forget missile on launch.
Now, all this advanced locking stuff comes with a downside that it can be jammed. Hence, the RPG will never get old. All you need to do is put a good night vision sight on an RPG system and make it available in large numbers throughout the troops. The only benefit which this very expensive sight is giving is the computation of future location. But the best predictor of future location is the human brain with target practice. And so, RPG specialists should be raised who go through rigorous training just like snipers receive specialist training.
Now, if the cost of the sight itself can come down to, let's say, $4000/-, it becomes much more viable.