They are most likely 40Euros on the island as compared to 35Euro online via Spotlight. Jumped a hefty queue last Monday with an advance ticket. Swapped printout for physical ticket at the internet pre-sales booth and got whisked straight in past the queue of other ticket-holders. Was worth it to buy on-line there, actually.
Interesting.
Although we found that €35 was standard cost at Tantra for a CircoLoco ticket, so approx the same as Spotlight.
We didn't have a queue issue as tended to get down relatively early.