Some guys don't perceive they change so they think several years-old pictures still accurately depict them. Or you have guys who killed themselves to be competition-ready, had a photoshoot 3 days out, and forever used those as their pics
Personally I keep my pics updated. I've met guys who clearly don't, however I've met some really
great guys who just happened to not keep their pics updated. Like, several. Hell the last guy I met (who I'm seeing again next week) looked nothing like his pics because he looked so much hotter in person. It was like wow, thanks for being really un-photogenic! I don't meet anyone just based on physical perception though. If I'm meeting someone it's because there was a clear-cut personality based connection.