I disagree for a large part. I think they just have undiscovered victims most of the time. When it does happen it is extremely rare. The man in the article was stated as killing 5 yrs apart and 2 killings. That's not a serial killer.
Maybe many take intervals or manage to get by with their weird fantasies, porn and over the line sick needs. Is it not the very fact they cross that line though even in thoughts and materials they watch or engage in that drives them back to the need and want for the real thing and a real victim? It is good enough for awhile but then they see the strangling, the erotic asphyxiation, a victim whether in their own imagination, a snuff film or who knows what else (I don't want to know what's out there that way, be up there with Redwine's weird "fetish"), or their own imagination, and it eventually drives them to acting on it again or even for the first time? No expert, just saying, I don't think they quit in general, most do not kill daily or three times a day to begin with and many have to cover or look normal in their every day lives if they have jobs, wives, families so they can't just go do it every time the urge hits. They do seem to value their own skin/freedom too and if they feel the heat is on them or they feel they made a mistake and will be caught they may lay low, which to me shows they can control it or some can.