Definitely a possibility. As a side note, however, three of the countries on his world travel binge (Turkey, Pakistan and Bulgaria) are potentially very low cost destinations once one gets there.
Basic hotel rooms, "mom and pop" type restaurant meals, and second class bus tickets are all in expensive.
I benefited from this low cost in Turkey. While there, i noticed a certain number of Europeans and Australians in Istanbul of dubious trustworthiness. They were not threatening but they did mix low cost living with using copious quantities of low cost hashish.
Likewise, Pakistan has long been a low cost destination for potential jihaders on extended vacations seeking religious instruction, contacts, or just to "check out" the scene. Some develop into Jihaders. Others lose interest and return to Europe or the United States.