I accidently bought a first class ticket once. What you get with it is you get moved to a waiting area with benches at the Playa pier and are first to board. There are some nice seats and tables on the newer ferries and you get first pick. To me it's not worth it. I prefer to sit at the back, outside if possible. The mid day ferries can get pretty full with the resort crowds going over for day trips.
The price difference won't effect people who use it a few times a year that much, the locals are the ones that will feel it the most. I haven't been going to Cozumel long, started less than 4 years ago. The bus tickets have gone up, Ferry tickets went up. When the Peso value went down the tourist bars raised their beer prices, new hotel tax. Overall it is still a very affordable but it is inching up.
The price difference won't effect people who use it a few times a year that much, the locals are the ones that will feel it the most. I haven't been going to Cozumel long, started less than 4 years ago. The bus tickets have gone up, Ferry tickets went up. When the Peso value went down the tourist bars raised their beer prices, new hotel tax. Overall it is still a very affordable but it is inching up.