I think there are several things to take into account. First, isn't it typically the case that more developed species are more susceptible to inbreeding than less developed species? I.e. humans versus ball pythons.
Second, I believe susceptibility to the negative aspects of inbreeding is related to how far a species typically travels after birth. Those species that wander far to find a mate are more likely to find less closely related mates than those that only travel a few miles. That being said, is there any data on how far ball pythons travel from the place they were hatched? If it is not very far, then one could expect a great deal of inbreeding in the wild, and so ball pythons would be adapted to deal with this.
JonV
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