I'm mid-assistant and selectively pursuing the market this year (location + trying to move up). I have only applied to positions I would seriously consider. In some cases, it has become clear that it is not a good fit, but I didn't know that until I got on campus. I am feeling some guilt though. About wasting time: mine, theirs, and others on the market. I know I shouldn't be…because, if the all the pieces came together I would leave, but there are a LOT of moving parts both professionally and personally.
That said, I am also pursuing a position wherein I was asked to apply. In this case, I am worried about burning bridges with a colleague that I highly respect. I am confident I'll receive a campus invite and it will take a campus visit plus an aggressive offer to get me to leave my current position. I have been upfront about that, but they have encouraged me to apply and thank me just for considering it. Any advice?
Again, I truly believe (after two times on the market) that a campus interview is a necessity and usually where you figure out if it is the right fit. The interweb just doesn't cut it. Maybe I'm wrong about that.