I read somewhere Lazlo said he didn't regret his action when juxtaposed with the current Bitcoin high price. I just hope he meant it. Otherwise, I don't think such is easy not to be a regrettable action.
I think he doesnt own only the 10k bitcoin. Probably he did have some more during that time thats why he sold off bitcoin and no one ever have the idea that bitcoin would be a lots of worth before. For other people maybe they cant take that scenario and possibly do worse or got depress badly. But seeing him calmly as now, probably he made some fortune on bitcoin before and who knows maybe more now.