Seeing the cause and effect of his surroundings, then maximising the amount of gain he can achieve with minimal investment seems to fit right in though. He demonstrated some of that when he forced the hand of the newspaper group fellow who was smoking.
He'll probably need a business partner like Fukube to be his database again though, since Oreki would be too lazy to read widely enough to make such deductions (though I also see Fukube as the wandering type). Mayaka will be there just because Fukube is.