You think the two cost the same amount of money?
Nope, but it's about priorities. Why fund a KOTOR timed exclusive when you can fund id software's next game? Every dollar counts when you're Phil trying to convince Microsoft's CEO to invest in Xbox. And to get that buy in from all leadership you pick your targets well. Why spend however many millions securing this timed exclusive would have been when you can keep them dollars for buying Bethesda or for buying Activision while investing in your first party? The job isn't done once they've acquired these companies. They now have to support and fund existing and new projects from their new studios and support whatever growth they need to undergo to complete them.
Would we prefer Xbox fund this Kotor timed exclusive deal over Obsidian making Avowed or a more ambitious The Outer Worlds 2? Over InXile making their new AAA FPS RPG and the studio growing significantly to support it? Would we take this Kotor timed deal over Fable by Playground? I sure as hell wouldn't sacrifice even Perfect Dark's revival for that Kotor Remake. To a degree we can have our cake and eat it too, sure, but at some point you have to balance that with supporting your internal studios.
Helping Bethesda with Starfield and then Elder Scrolls 6, doing what you can to allow that next game to come as quickly as it can, in as high a quality as possible. Helping Arkane with Redfall, helping id software with their upcoming projects, funding certain affinity to build an apparent monster hunter style new IP and make a battle royale for Halo. Have the Just Cause and Mad Max team make Contraband as an Xbox exclusive. Or the rumored IO Interactive Fantasy RPG exclusive. Allowing Ninja Theory to raise their ambitions to AAA levels for Hellblade 2. There's even that rumored Wu Tang title. I'm definitely curious about that. Microsoft has a lot of studios to think about now, a lot more than before. And they have to be wise with their spending. Just because they got a shit ton of money to throw around doesn't mean they don't have to be smart and strategic with it. For every 3rd party timed deal you do, you risk not funding an internal studio project at all, not funding it enough, or you risk running well over budget in order to give it the funding it deserves, something I'm sure Microsoft is willing to do, but you want to limit those instances.
A lot of Xbox fans behave as if Microsoft can just buy everything, but they never could. Sure, there's a crap ton of money hats in $68.7 billion spent on Activision and $7.5 billion spent on Bethesda, but they are still running a business where they want some certainty. They want to invest in the next Wolfenstein, and then be confident that another company isn't going behind their back and cutting the deal on the next Wolfenstein because of how successful the last one was. They've made big bets on those purchases, and they need to be quicker to support them to build new games before they go try to cut a multi-million dollar deal on a 3rd party title where they don't own the IP or the studio involved.
I've talked quite a bit about Microsoft's new studio acquisitions, but they had game studios before Bethesda and Activision (still in progress I know). What is Coalition making? Fund their next game before a KOTOR timed deal. Microsoft took some big bets. They bet on Stalker 2, but Russia attacking Ukraine happened, nixing that, though it does appear to be back on track, which is wonderful.