JoaT
I do not think that forbidding to take NAS or requiring to dump points gained from NAS is fair, because:
- if NAS SS dose not pay more for it .. both races get similar advantage as they both get penscans .. Joat with NAS just build more cheap scouts to get planet scans, with penscans SS with it's first scanner emulates Joat with elec 4/5 increased cost is peanuts compared to resources spend on warships and research or just planet dewelopent. Midgame cloaked robberbarons are IMO far superior to joat scanning ships .. they allow to scan whole enemy territory while Joat simply can't if that territory is deep enough .. and they have other uses during planetary siegeges .. or raids and again expenses on them are irrelevant as they are tiny fraction of resources spend elsewhere.

- how often one sees Joat in the game ? Far lees often than IS or SD,SS I would say. This prt does not have any special ability .. it just have more resources (but it does not translates into minerals so after midgame this becomes more and more useles) .. I would not gimp it further. Good scanning/penscannig may be only thing going for Joat in lategame and still not magic bullet as tachars are.

- also proposed method to taxing for is bit unfair as it requies to dump base NAS pint gain , what about case when NAS point gain is lowered by number of LRTs taken? my point is that in such cases point gain from NAS is lower and thus impact on economy settings.