I just thought I would share with you our experience at CDG last month. We had just left immigration after a one-hour wait, preceded by a 12-hour flight, so we were exhausted and not thinking clearly.
As we approached the doors leading to the taxi pick-up at door 1, we were approached by a man who asked us where we were going. I told him we were heading to Ile Saint-Germain and he directed us to door 6 at the far end of the corridor. We pointed to the first door that was marked "Taxis" but he insisted that the taxis to Paris were at door 6. We walked a short distance and then stopped to discuss this because it didn't seem right. At this point, we were approached by another man who asked us where we were going and he also pointed us to door 6. Once we arrived at that door, there was a queue of taxis, but no passengers. A group of drivers were standing around and one of them quickly approached us. I asked him how much it would be to take us to our hotel, fully aware that there was a flat fee for that trip of 60€. He pulled out his phone and brought up a navigation app. He told us that there was currently a lot of traffic and that it would be 140€. This confirmed my suspicions that we were in the wrong place and I quickly said "non" and headed for door 1 where we found an orderly line and an attendant managing the queue. I asked the driver the price and he replied "60 Euros". I also asked if he would take a VISA card. He scowled but said that he would. Once we arrived at our hotel, his card reader would not work and he insisted that I pay in cash. I did not have Euros with me because I thought that if I could find a taxi that accepted VISA, I could pick them up at an ATM near the hotel. I had to quickly find an ATM and withdraw cash while he waited.
Long story short. Watch out for these con artists that stand near the taxi door at CDG. Never go to door 6! Be aware that there is a flat fee for a ride into Paris. 55€ for the right bank. 60€ for the left. Bring Euros with you or withdraw money from an ATM at the airport.