It would appear that there are many 'fake' teachers and some with a little inner experience who can actually see some visions, and so they believe that they have achieved Oneness with God.
My Guruji used to say that realised souls are so rare, that you can literally count them on your fingers. The Sage Vivekananda used to say that they grow like mushrooms! It is a very lucrative business.
I spent 35 years with a man who never charged for a single class and we continue this process even today. Yet many spend lots of hard earned currency going on 4 day retreats or weekend intensives. They are also on the increase. There are a few sincere ones or teachers but by and large, Sadguru's (genuine Masters), do not charge for their teachings. Why? They are only reminding us of what we truly know.
Now ' holy' implies 'pious' or devout. Not only The Christ but other God-men really had a go at those dressed in habits and robes. One needs to be so careful! They can appear in sheep's clothing, but be as harmful as wolves.
The spiritual Path is a long, narrow and arduous journey and unfortunately many look for short-cuts and many exploit this need.
The funny thing is that you should not get trapped in this though. If you are sincere, then you will get to know these things and God will show you a way. But the spiritual life is essentially the transformation of one's lower nature and no one else. God won't ask you about Jim or Joan or even your mom and dad in heaven, but all about you. It is a personal journey and that's worth remembering. Look inwards not outward. God bless.