CLAWS - 289k research points, other than artilery they literally don’t matter.
NASAMS 3 - 295k points, only artilery and missile are useful
IRIS-T - 281k points, only artilery is useful here
Pantsir SM-SV - 301k (insane), I guess here you have range finder, tvd, missles and artilery which are useful, but still the cost is insane
BUK-M3 - 288k, range finder and artilery are useful
This is on par with top tier tanks (T90 has 301k, T80 290k, Leo 2A7V 297k, Abrams 299k) which is insane. The game is centered around tank combat not SPAA combat. Most of the time playing SPAA is quite literally just sitting at your base, maybe shooting down one or two planes and then getting killed by a heli.
SPAAs shouldn’t require the same number of research points as tanks because there is less to do with them and research point gain is much, much smaller.