That's hardly a negligible difference over the course of a week.
$11 VS $20 is almost a 100% increase assuming two people, or almost four times as expensive assuming one person.
Let's say you take conservatively 2 trips a day(I know the last time I was there I was making 3-4 round trips a day to check out different places) that's an extra $126 over the course of a week.
This is all assuming that every driver is going to charge $20, I had drivers quote me $15 one way before, the wild fluctuation in pricing means that you're eventually going to be paying more than $20 for round trips.





