But that's a tactical choice not the Units ability. Same person could have Advanced a Tactical Formation? Should the T-Bolts be be priced higher in SM list than another list for that? Just because an Army has a better chance to go first doesn't seem enough reason to change a formation prices between lists.
Well...that IS crazy
A Startegy Rating 5 Thunderbolt formation has a much better chance to go on CAP first than a Strategy Rating 3 Thunderbolt formation. So the former has to cost more.
That's like saying their AA weapons shouldn't cost anything because they might ground attack instead. Of course SR5 is a huge benefit to interceptors, to suggest otherwise is absurd. You can prefer to live with the boost for the sake of keeping allies costs the same across the board, but you're scraping the barrel here a bit here to suggest there is no boost.