I cant imagine leaving mine, but in the end we do not know what the dynamic was between SK and his family. Especially towards the end of the weeks before he disappeared. We dont know what his conflicts were-it appears that a simple word to his family would have taken care of his bills...specifically his rent. But if he reached out regarding that issue, we dont know it.
I think he had some debt piling up and no way to pay for it himself unless he was working a job that no one seems to know about, or at least no one appears to be discussing.
A single guy in the Las Vegas area-he could slip away unnoticed. I think we have discussed several men who disappeared from Vegas alone much less the rest of the country. There are 800K MP on the books in any given year. They are not all dead, especially dead from foul play. The majority must be voluntarily missing. IMO anyway.