They don't test themselves. Over and over again.
With friends, family, neighbors, strangers.
And yet, they are willing to pay out time and money, fair amounts of both in some cases, to travel across the world to be filmed failing to do what they claim.
Very strange.
I think the problem is that many of them just don't understand what testing really means. They have usually been doing whatever it is they claim for years, and they consider those years of un-blinded, uncontrolled activities and confirmation bias to be tests. After all, they're not stupid and couldn't possibly have come to believe they could do things if there wasn't really something going on. And the friends, family and so on are part of the problem, since they're just as likely to believe as the applicant themselves. Skeptical thinking and knowledge of controlled testing just aren't all that common.
Are they cold-blooded opportunists or ardent believers?
For the most part, the people who apply for tests are believers. The frauds who know they can't really do anything are not generally stupid enough to take part in tests that would prove that.
In other words, a danger to the community or harmless cranks with an excentric hobby?
However, that does not mean that they're all just harmless cranks. If someone claims to be able to heal people, it doesn't matter if they really believe it or are just a con artist, they're still dangerous to the people who believe them.