Etiquette, my ar*e! They just want to monopolise the whole private transfer business and force people to spend £50 with them rather than £30 with someone else, pure extortion.
So anyone picking up at Dalaman will now have to have the name of every passenger written on their board? I don't think so. The whole point of the boards are to identify the drivers to the person or persons being picked up, they are not a legal document!
Unfortunately there have even been incidents of Taxi drivers at Dalaman ganging up and dishing out beatings for perceived breaches of "etiquette" by other drivers.
Hopefully if enough incidents get reported the authorities will act to stamp this extortion out! But I'm not holding my breath!
Sorry to be so emotive about this, but as I see it, it's yet another Dalaman rip-off, and something else to sour visiting tourists first and last impressions of Turkey.