I have to be honest, the 'High Priest' title next to the people you mention, can be very misleading. If one thinks that many of these individuals were on HPS Maxine's and HP Hooded Cobra's level, because after all they were 'High Priests' too, one couldn't be more wrong.
Back then titles were given also because of contributions and work, and some of these people didn't even do that much work neither were they really "advanced" to be honest. An opportunity was given to these people, if they took it they would've "grown into the title" with time, actually becoming worthy. But they didn't, they quit. Satanism is not an easy path, it's for the strong of spirit, we have been in a spiritual warfare for a long time, back then the enemy presence was stronger, making things even more difficult. Only the strongest keep at it for a long time, this is a reality of life. In life you will see people quit all the time, in all endeavors. It's just how it is. Many of them didn't "betray" us, they just quit or made mistakes in life.
You have to keep in mind that there is a continuous evolution in life, with people, and with Satanism too. HPS Maxine Herself has evolved incredibly since She started the JoS, like we all know from the last Ritual. HP Hooded Cobra has stated many times how much He has evolved in his Path. If you compare HP Hooded Cobra and HPS Maxine now, with the people you mentioned, it's like comparing an elephant with an ant. So don't waste time thinking about those individuals, they are not worth the time.
Everything evolves. With time the JoS will only evolve more and more, becoming better and better, with everyone here being much more evolved, even the average member. In the future what is now considered "advanced", will only be average, as we discover more and more, we keep evolving and we work with the Gods.
Lastly, when a title is given to someone, this is not the end, this is only the beginning, this goes for all positions of power/influence in life. One then has to prove that he/she is worthy of that title with his/her actions and work.