I know plenty of people who "date up the ladder" - the question is whether they stick with the person/people they're currently dating until they get a better offer. I've seen plenty of women "use" their current date's status and connections to meet more people.
Most Helpful Girl
If they weren't the one for me, I would definitely continue dating but I would make sure to let them down gently, explaining carefully why it isn't going to work out while still being respectful towards them as a person. However, I would have to be absolutely sure that this person wasn't the one for me. I'm not one to make rash decisions. I have to think about things extensively before I do them.