I have heard people say that such constant, high humidity can be bad for them. However, I don't believe I've ever heard such a definitive statement from a source that I trust to say such things.
I don't believe that is the typical, daily humidity in their native ranges. They are from somewhat arid grasslands, for the most part. Folks have used that as a reason to suggest that humidity should NOT be kept even as high as 50%. But the underground burrows and termite mounds that they live in maintain humidity that is lost on the surface.
I personally, would try to avoid letting it stay that high all the time, but as I said, I don't have any specific trusted source to back up that level of caution. Just a feeling.
The most important thing to consider is whether or not that level of humidity is causing any mold or mildew growth within the enclosure....and also, if it's keeping the substrate too damp. Constantly damp substrate in an environment where bacteria are even more likely to thrive (warm and extra humid) can lead to scale and skin infections.
EDIT for one more thought: My statement is entirely about ball pythons. I don't know much about the natural ranges of burms.
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