I really don't like rules like that, but I understand why they are there. Some folks just don't know what they are doing, and can be problematic.
That kind of rule is something that I see more of at indoor ranges, and I assume this is to protect the range itself. I've seen ranges with bullet damage in the ceiling, floor, and along the side walls. I remeber shopping around in a store/range several years ago and seeing a woman shooting with a male partner. For some strange reason, she had the butt against her hip, and the barrel was up at a 45 degree angle. BOOM! She fired the gun and pieces of the ceiling came raining down. BOOM! She fired a second time, before any of the folks working there could get her to stop.
Then you've got people that buy guns that they can't control, and send shots all over the place.
If a range has reactive targets, you've got to worry about folks shooting at them with rounds that they aren't prepared to stop. I've seen people shoot at rimfire-gauged steel with their 22 Hornets, and even jerks who shoot down the supporting posts of standing targets.
One round a time, slow fire only, no drawing from the holster, and rules of that nature try to minimize the damage to range or decrease the danger posed by a shooter to his fellow customers, but they tend to frustrate the experienced, knowledgeable customers.
So, what do you, as the owner of the range, do? You can limit your range to members only, or you can require that all shooters take a 10-minute familiarization class, or you can increase your rangemaster staff, but all of these will cost you money.
Personally, I prefer ranges with minimal rules. As was stated earlier, only 4 are required. But, if I'm shooting at range with these rules, I understand why they are there.