Had you obviously just arrived on the island and walked out from the airport? If that were the case I guess that it's not all that surprising that the fare was higher. As I said earlier, when I was there a couple of weeks ago (about my 40th trip to Cozumel), the fare for my wife and me between Blue Angel and Cozumel Scuba Repair (about three miles by Google Earth measurement) was 120 pesos (~US$6) each way. We traveled by taxi the entire two weeks we were there and I did not find the taxi fares to be significantly higher than in previous trips.Yeah ok but last week was my fourth time there in a year. I am familiar with recent cab fare prices there. Diego’s tacos to north hotel zone was never more than 5-6 bucks or 100 pesos. It was literally 3-4 taxis in row that would start at $15 and barely negotiate down to $12. I also saw increased fares throughout the week as well. Might have been coincidental.
We always take the shuttle from the airport, so I don't know anything about taxi fares from walkout points. I know that the fares to the airport are higher than other trips of similar distances.