As a regular user of Lyft i still have 0% loyalty. I can get 3 or 4 different services in my city and you can be sure i'm picking the cheapest one every time. As soon as VCs stop subsiding my travel expenses ill move right on to the next service.
I'm guessing some of you are locked in for 6 months and my post made you sad =(
Neither Uber nor Lyft have any exclusive rights to dropping people off at the airport.
The problem comes with your "a dollar less" caveat. You star EpicEng's ride share and undercut Uber/Lyft by a dollar. They respond by matching your price and giving drivers more incentives so they don't switch. Now what do you do?
FB is successful because no one I interact with is on a different platform. They same is true for them, so we all stay. Network effect.
But in general the answer is either having a disruptive strategy or else a huge amount of money to woo existing market participants. Most of us don't have either. That's the barrier to entry.