Many jocks are told to talk as little as possible and just play the music. OK, but the problem is that the few chances they do get to talk, it's usually a pitch for some sort of station promotion or an upcoming remote... something that involves mentioning sponsors. People pick up on that... they know that almost every time the mic opens, it's time for a commercial.
Look at the recent history of remotes. When someone was doing a remote 10 years ago, they were truly broadcasting live from a location, doing their entire show there. When jocks do remotes today, they're on the air 2, maybe 3 times an hour, and it's just a glorified live commercial. And again, people pick up on that. Most listeners don't show up to remotes because they know the station is just the "bait" for the car dealers, cell phone sales people, or whoever, to reel you in. In some cases, the station or client might be offering a giveaway that makes it worth stopping by and getting harassed by salespeople, but usually no. I think it's also the fact that if you're a listener and you stop by, it's not too exciting to see a jock go on the air twice an hour to give a sales pitch. Doing an entire show, that's different. People might come down to see that.
Bottom line, most jocks rarely get to show their true talent these days. If it's not a sales pitch, it's either the weather, or it's because the intro into the next song is so short, you've only got enough time to say the name of the station. That turns off the listeners... and it's probably also making it harder for jocks to establish being "known" like you mentioned.