From a strictly clinical view, are those who have spiritual gifts actually suffering from mental illnesses?

[Act D]

it is only a mental illness if it interferes with their ability to lead life in a 'normal and productive' manner. You can see/hear/feel an entire orchestra of experiences and as long as you can function in life you are not clinically mentally ill. (you may be neurochemically, socially, and/or intellectually ill)

it could become a mental illness if the 'Voice of the Great Spaghetti Monster' were so loud and invasive that you could no longer hold down a job, take care of yourself physically, attend to the voice instead of to your physical surroundings.

i would position that many of those claiming to have gifts (ie: psychics, etc) are closer to sociopaths, as they prey upon the ignorant hopeful, leeching both their money and their hope away.