Huh?
What that does is add 8 bpv to the ranger, 6 to the horseman, 4 to the lancer, etc, etc. Already for GSA these ships have a BPV above their value since these fighters are always changed, as they are useless. As for cheaper - I don't know what you mean. When you buy fighters, they're the same cost, always. There's no "upgrade" discount. Therefore, this represents a surcharge that adds nothing to the combat value of the ship. The Overlord in no way is a 192 BPV ship. It's either 180 (without fighters) or 240 (with fighters). Or that's the way I think of it anyway.
On another topic, you've said previously that you don't really have any interest in working on a fighterlist. If I were to do so, and submit it to you, would you possibly be interested in hosting it? I'd like to take a crack at it, using a "Taldren" style with a SFB base.