What you say makes sense. If you manage a 100 million dollar business, and your private fortune is 5 million, why on earth would you wreck your business and make lots of people get pissed at you, when you could've just kept doing what you do and increasing your wealth.
That's the logical and sensible thing to assume, however at this point it can be proven without reasonable doubt that Mark Karpeles is in no regard a 'normal man'. He does not function like a normal human being, his lack of logic is appalling, his social skills are nearly non-existent, his consistency is that of a pathological liar. There are tales about his lack of morality (previous crimes) and his lack of regard for other people. He might have aspergers, he might be autistic, but all of that is completely irrelevant as what matters is that he failed as a business man, all personal issues aside - the end result is that millions were lost, and it's not communicated at all the truth about what happens.
I would not even trust Mark Karpeles to hold a coffe cup. Honestly, I'm not even sure if he grasps the severity of the current situation on a logical and intelligent level. Him being a man with a 190 IQ as some articles would have it? Well, he beying above Einstein and Kasparov? Fat chance.. This is a person that is exploiting other humans with no regard or respect for them whatsoever.
I sincerely hope he gets locked up for a long time to come. Then he can ponder on how 'unlucky' he was and how 'unfair' everything is, and how it was never 'his fault'.
Please don't use any kind of logical or common sense reasoning when trying to explain what he does. The mere fact that he was more concerned about hacking a chash register to accept bitcoins and making a bitcoin cafe, while everything crumbled around him, speaks mountain about him being nothing but a lazy selfish irresponsible man-child.