Yes, he probably didn't want to do the approach. Some pilots are lazy or in a hurry.
Last year I experienced this first hand. I and another plane a few miles behind me were coming to KEDC which had an overcast layer somewhere around 1000ft AGL or so. We were both with Austin Approach. I asked for the GPS 13 approach, and he cancelled IFR and reported the field in sight. Because of that he was able to take a shortcut and head directly for the field and so got in before me. I had just got my IR, so didn't think to say anything at the time (I was concentrating on the approach). In retrospect I should have told approach that there is no way he could have been able to cancel IFR. There were no gaps that he could have snuck through. Not that I want to play policeman or be a tattletale, but there are REASONS why we have these rules and pilots like that could one day run into one of us because they are too important/skilled to feel the need to follow the rules.