Never pay anyone to protect you from a psychic attack or remove an evil spell from you! Be beware of those who will tell you that you are under attack or under a spell and will stop it for a price. Those who do it for money are unlikely to have the power to help in the first place.
For instance, Lamaism, a branch of Buddhism, states that the more money a psychic asks, the more their vibrations are lowered and they will be unable to preform their stated service. Truth be known, I've never met a psychic healer, clairvoyant, etc, who has ever successfully healed or protected someone by their methods when being paid a fee. (Having said that, I have seen people healed when the treatment was given free and with love.) Of course, donations are acceptable.
I believe that it's not actually the money that reduces your vibrations or ability to heal, but your intentions and ego. If you intention is to make money, then so shall it be, but normally at the cost of your ability to heal. If your intention is to heal, then so you shall, but you might not automatically make money. It very much depends on what your attitude is towards money. Is it something 'bad' or is it simply a tool to help get what you desire?
The other one, ego, happens when a person has great success to start with, and then 'forgets' that their power comes from a greater source. They start to let their own feelings and beliefs override what should really be happening. They might even tend to put themselves on a pedestal, Hence separating themselves from the source and others. They become totally ineffective.
I don't have a lot of good things to say about psychic healers. Yes, there are some out there which can indeed heal, and there are some out there who are very psychic and do have powers. My experience has been that despite their obvious powers, many of them forget they are just a channel for healing and ego and false humility sets in. Also be wary of those who call themselves 'Master'. 'Master is a term of separation and I believe a true Master will be humble and will not call himself, or let others call him that title.