Charging for parking always felt like bullshit to me anyway. The ticket should include that
The venue doesn't always own the lots, which makes working out a presenter (WWE)-venue-parking lot deal involved. And the presenter generally wants to advertise the lowest ticket price possible to avoid sticker shock, which is why stuff like service fees, etc. -- fees that generally pay for the venue/ticketing outlet's services -- are tacked on separately.
And stuff.