No need for a reason at all. I always like admiring other members' 4runners. I like the blackout headlights. I never would have thought of putting the sticker on the frame like that, most original placement I've seen yet. And if you like the seat, then by all means, roll with it. I myself wish the stock seats had more side support and adjustable side bolster. I tend to shift a lot when cornering and never felt secure in the stock seats.
You can always take the sport bumper trim off. It's just plastic, but I think you'll be left with some holes on the front on your bumper after removal. I don't think it's really attached to the actual frame.