Because she's perfect.
The way I see it, there's no point to straying, no logic to it, no reason.
Other characters out there might have one or two nice traits about them, but they could easily have nothing else going for them past their pretty eyes or cute voice or whatever which just come off as gimicks, my waifu is the full package as far as I'm concerned. Everything about her complements everything else without going overboard in any particulate area.
As I've said in the past, it's compatible to items with stats in a videogame. you'll come across plenty of items with one or two nice features, like a smg that sucks in all reguards but can set enemies on fire, so it's got that going for it, but then you find a gun that does more damage with the same ability but it has lower reload times., you keep going and keep coming across items with their ups and downs while trying to get slightly better and better items. and the way I see it, I found that end game item that makes all other items pointless. it might not have some of the cool ability the others lower level items have like setting enemies on fire or giving them poison damage, but it's still the best and most valuable item in the game. Kinda like the R.y.n.o. in ratchet&clank.