Because standards now are slop, from collection through out. The mass quantities being collected, every thing thrown together, quickly moving through and nothing kept clean. What people call live rock is a joke, I won't use it anymore. I worked at a top notch store around 1990, we use to get live rock and clean it using magnifying glasses and a series of pick tools. Rocks, macros, inverts, and fish were all kept in separate systems. It's ridiculous to think that today you can transfer a fish disease to your tank because inverts systems are plumbed right into the fish systems and running right through the live rock containers; what a joke. I've been around 30 years now, I would not start in the hobby today, We had this same discussion about disease before, and it's just as bad.