@superking & Elukka: Well, thematically, it does pay for them. As far as taking away from other stuff that's actually present in the galaxy in the game, why should it do that in this case when it doesn't "pay" anything for:
1) Waves getting larger with higher AIP.
2) Reinforcements getting larger with higher AIP.
3) AI Eye spawns with more human ships on the eye's planet.
?
I do sympathize with the desire; honestly I prefer an opponent that has a visible infrastructure that I can actually do something about and is a closed system entirely visible to me (that was one of the inspirations behind the hybrids), but the AI is simply not designed that way (and that is one of the reasons it is so much more effective than most RTS AIs) and for this one mechanic to start acting like it wouldn't really fit.
The first two are things the human pays for getting more planets. It is also limited with time.
AI Eyes I think spawn a ridiculous number of units which leads to repetitive motions against them that usually aren't a big deal to execute. It doesn't have a limit either, but at least you can avoid the penalty, or at least have it only spawn, at worst, 1/2 your ships in the system for each AI Eye if you do a huuuuge arc around the thing.
If fleet ships + starships seemed like they would ever get to 10k firepower, I'd be more concerned with this new mechanic. As that doesn't seem to happen, not too worried since that's all that's generally needed for victory. If they do eventually though, it's just a reason to only ever pick the best ships, again, and not build certain ARS ships except for last when at cap resources and then leave them somewhere where they'll rot doing nothing except in emergencies.
This is worse than taking a ton of AIP was/is for the two golems that are both automatically over 10k firepower and worse than a full fleet of ships. The stream of ships is pretty ridiculous. I don't know if this makes spirecraft a terrible deal as well right now.