Filling in the holes is an acceptable part of the hobby, its just this ridiculous hypocrisy that gets thrown about, like we do all and any damage to the environment. (Mankind). They fail to see nature destroys and rebuilds itself over and over for billions of years. I mean how many bloody bunnies are there in oz? Digging burroughs, making more bunnies, but some poor bugga digs a hole looking for a piece of nature to admire, or sell to somebody else who will appreciate the beauty, and suddenly the planet's gunna chuck a hearty according to these panic merchants. Earth has been around for about 4.5 billion years, constantly changing, evolving into the planet we know today. But in years to come our land masses will again form a super continent, and our current borders will mean nothing. The hole dug in the bush in Victoria a million years ago will probably either end up at the bottom of the ocean or the top of a mountain range.