Mines the other way around,I don't worry about it,it's only the road car and no extra wear on tyres,can't be arsed to mess with it tbh.
How much more? 0,2-0,4° is ok, but you shouldn't have more than 1,5° of camber...
Well, potholes, stress in the turns, a little accident, etc can bend a little some component, or maybe the car wasn't perfectly straight from the start.
Have you just bought the car or what?