Why blood pythons?

[Bogertophis]

... Maybe some of you could try to explain what it is that makes them good pets? ...

I think you've got the answer now: every kind of pet has some drawbacks, & these are no exception. (It should be noted that humans have their faults too, lol.) So you take the "good with the bad", but these are some seriously-great-looking snakes! Even if they occasionally flood their premises- hey, nobody's perfect!