Parking away from other cars doesn't always help - it can attract people to park near you! I parked my Z4 at the far end of a virtually empty car park the opposite end to the store. When I came back I had a people carrier one side of me and an old battered Mondeo the other. No other cars.The mondeo was so close I had to drive the car out of the space so my wife could get in the car. Clearly done on purpose - they were willing to walk the length of the car park just to park next to my car!
The same happened in my Audi yesterday. Parked miles from the nearest car. Came back to find my car with another next to it - both cars sitting 20 spaces from the nearest car!